If you're looking for a luxurious and comfortable sleep, investing in a silk pillowcase might be worth considering. Not only do they feel incredibly soft against the skin, but they also have a number of benefits for both your hair and skin. However, with so many options available, it can be tough to know which is the best 100% silk pillowcase for you.
Before you make a purchase, there are a few factors to consider. Firstly, you'll want to ensure that the pillowcase you choose is made from 100% pure silk. This ensures that you get all the benefits of silk, without any added chemicals or harsh materials. You may also want to consider the thread count, as a higher thread count often means a higher quality and more durable pillowcase. Size is also important, so make sure you measure your pillows before purchasing.
If you're wondering why silk pillowcases are worth the investment, consider these questions: Do you struggle with frizzy hair or bedhead in the morning? Are you prone to wrinkles or acne breakouts? Do you sleep on your side or stomach, leading to wrinkles on one side of your face? A silk pillowcase can help combat these issues and leave you with smoother hair and skin. Plus, the luxurious feel of a silk pillowcase can add to the overall comfort and quality of your sleep. So, if you're looking for a way to make your sleep experience as comfortable and luxurious as possible, a 100% silk pillowcase might just be the answer.
10 Best 100 Silk Pillowcase
# | Product Image | Product Name | Product Notes | Check Price |
---|---|---|---|---|
1
|
This product is ideal for promoting healthy hair and skin while providing a comfortable and luxurious sleeping experience.
|
|
||
2
|
This product is ideal for providing a soft and comfortable sleeping surface while helping to protect hair and skin.
|
|
||
3
|
The product is ideal for protecting hair and skin while sleeping, due to its 100% mulberry silk material.
|
|
||
4
|
Ideal for improving hair and skin health while you sleep, and comes with a matching eye mask and laundry bag.
|
|
||
5
|
Ideal for promoting healthy hair and skin.
|
|
||
6
|
The product is ideal for protecting hair and skin due to the soft and breathable silk material and envelope closure.
|
|
||
7
|
This product is ideal for improving hair and skin health while also preventing wrinkles and stains on standard-sized pillows.
|
|
||
8
|
Ideal for enhancing hair and skin health with its 100% pure mulberry silk and moisture-wicking properties.
|
|
||
9
|
This product is ideal for women who want to protect their hair and prevent wrinkles while side sleeping.
|
|
||
10
|
This product is ideal for providing a soft and comfortable pillowcase for your hair and skin.
|
|
1. Silk 600 Pillowcase For Hair & Skin.

Introducing the luxurious silk pillowcase, designed to enhance your beauty and promote healthy sleep. Unlike harsh and thick cotton pillowcases that can cause creases on your face, the soft and smooth silk fabric has a friction coefficient of only 7.4%, making it the perfect choice for maintaining your skin's moisture and reducing the appearance of fine lines and wrinkles.
But the benefits don't stop there. The natural proteins found in silk can also minimize split ends, frizz, and dryness, resulting in smoother and more manageable hair. With a reduction in friction by 43% on average, you'll wake up to a salon-worthy look every morning.
Silk is also a natural temperature regulator, helping to maintain the correct body temperature and keeping you cool in the summer and warm in the winter. It's a symbol of love and elegance, making it an ideal gift for special occasions such as birthdays, Valentine's Day, or Christmas.
As a skin-friendly and hypoallergenic material, silk is a choice you can feel good about. The pillowcase is designed with a hidden zipper for easy fitting and to secure your pillow overnight.
The company is dedicated to providing a better silk pillowcase to enhance your beauty and promote healthy sleep. They are so confident in their product that they offer a 100-night guarantee. If you're not completely satisfied within 100 nights, you can return the pillowcase for a full refund, no questions asked.
Upgrade your life and your sleep with the luxurious silk pillowcase. Order now with no risk and start experiencing the benefits of a good night's sleep.
2. Peony Silk Pillowcase: Softly Luxurious Beauty Sleep

Introducing the Satin Pillow Cover – a luxurious and practical addition to your bedding collection. Made with 100% polyester satin, this pillow cover is designed to provide a smooth and soft feeling while boasting a distinctive and lustrous appearance. Available in three sizes – Standard Size (20x26in/50.8x66cm), Queen Size (20x30in/50.8×76.2cm), and King Size (20x40in/50.8×101.6cm) – you can choose the perfect fit for your pillow.
This pillow cover is not only aesthetically pleasing, but it also boasts a range of benefits for your hair and skin. The tight weave of the satin allows your skin and hair to glide gently over the pillowcase, reducing friction and preventing knotted hair and facial wrinkles. You'll wake up feeling refreshed and rejuvenated.
The Satin Pillow Cover is designed without a zipper closure, so you won't have to worry about any poking or discomfort while you sleep. The envelope closure makes it easy to remove and fix the pillowcase, preventing any hair from being pulled. Additionally, satin pillowcases are cool in the summer and warm in the winter, making them suitable for use all year round.
Cleaning and maintaining the Satin Pillow Cover is easy. You can either hand or machine wash it with mild detergent and then hang it on a rack to dry. If you have any questions or concerns, the manufacturer offers friendly customer service to ensure you have a pleasant shopping experience.
This pillow cover makes for an excellent gift choice for your loved ones. Its elegant and noble appearance makes it a symbol of love, and it's a perfect present for occasions such as Mother's Day, Thanksgiving Day, Christmas, birthdays, and anniversaries.
Upgrade your sleeping experience with the Satin Pillow Cover today and enjoy the benefits of softer skin and smoother hair.
3. Silk Pillowcase For Hair And Skin Care.

Introducing the Promeed 25 Momme Silk Pillowcase: a luxurious and high-quality product that boasts a range of benefits for your skin, hair, and overall wellbeing. Crafted with Organic Grade 6A+ Mulberry Silk, this pillowcase has been certified by OEKO-TEX STANDARD 100, ensuring that it meets the highest standards of quality and safety.
One of the standout features of this silk pillowcase is its ability to slow down the aging process. The smooth surface of the Promeed New 3rd Gen Silk reduces the friction between your skin and the pillowcase, which can help to prevent the formation of wrinkles. This is particularly beneficial for those who tend to toss and turn in their sleep, as this can be a major cause of premature aging.
In addition to its anti-aging properties, the Promeed Silk Pillowcase is also great for your hair. Its soft texture allows your hair to slide rather than tangle and knot, reducing the damage that can be caused over time. If you're looking to maintain your hairstyle throughout the night, sleeping on a silk pillowcase is widely recommended. It can also help to slow down the buildup of oils in your hair, allowing you to extend the life of your style.
For those who suffer from hot flashes or excessive sweating at night, the Promeed Silk Pillowcase is a must-have. Silk is a lightweight and breathable material that acts as a natural heat regulator, helping to maintain a cool and consistent temperature throughout the night. This can help to reduce excessive sweating and slow down the onset of unwanted hot flushes.
Despite its luxurious feel and high-quality materials, the Promeed Silk Pillowcase is also incredibly easy to care for. It is machine washable at a gentle cycle, and its durable construction means that it will remain smooth and soft to the touch even after multiple washes.
4. Silkskin Pillowcase Set With Eye Mask – Navy

Experience the luxury of royalty with this luxurious silk pillowcase. Made with 600 stitches woven jacquard, it is more durable and wearable. The three-dimensional flower pattern adds a brilliant color to the pillowcase, making it stand out from other cheap items. The exquisite embroidery adds to the luxurious feel of the pillowcase.
This pillowcase is made with the highest grade (6A) long fiber mulberry silk for both sides, with a thickness of 22momme. The manufacturer enforces the strictest quality guidelines, ensuring that the silk is free from toxic harmful chemicals and is OEKO-Tex Standard 100 certified. This guarantees the quality, comfort, and wellness of the pillowcase.
Not only is this pillowcase luxurious, but it is also beneficial for your hair and skin. Real silk pillowcases are the most natural anti-aging product. The soft silk's natural fiber and tight weave allow the skin and hair to glide smoothly, reducing friction by 43%. This helps reduce facial wrinkles, prevent dry/knotted hair, and reduces hair loss. Improve your sleep quality and enjoy sweet dreams every night.
Silk is the most comfortable of all fabrics because of its natural protein structure. This pillowcase is available all year round, as it regulates heat, keeping you cool in hot summer and warm in winter. It can improve your sleep quality, transforming your sleep into a silky spa and refining your life.
This pillowcase comes with a gift box packaging, a wash bag, a silk sleep eye mask, and an earplugs set. The Hidden YKK Zipper ensures that the pillow stays in place without moving around and doesn’t scratch the user. The large opening and long zipper make it easier for you to place pillows in the case.
This silk pillowcase is a great gift choice for anyone who enjoys restorative sleep. It comes in a variety of solid hues depending on your room's style and color scheme, giving you more choice. It is a great gift for mom, wife, girlfriend, or anyone else who appreciates luxury. If you encounter any problems with the product, please contact the manufacturer to receive a free replacement.
5. Silky Breath Pillowcase – Queen Size

If you're in need of a pillowcase that can keep your skin and hair healthy, then the 100% pure mulberry silk Slip Silk Pillowcase might just be the one for you. However, it requires more care compared to regular pillowcases due to its delicate material.
To keep it in good condition, it's recommended to wash the backside separately with mild detergent in cold or lukewarm water, or have it dry cleaned. Bleaching is not advised, but you can use cool iron on the backside if needed. With proper care, this pillowcase can last a long time.
Aside from being easy to care for, the natural silk material can also keep your skin moist and prevent wrinkles and aging. It's hypoallergenic and gentle on sensitive skin, making it a great choice for those with skin sensitivities. Plus, it can prevent hair knotting and give you a comfortable and cool touch while you sleep.
The zipper design keeps your pillow secure inside the case throughout the night, so you don't need to worry about it coming out when you move around in your sleep. The soft and smooth texture of the mulberry silk pillowcase is breathable, allowing you to have a good sleep while using it.
The exclusive envelope closure end design prevents your pillows from escaping during your sweet dreams. This pillowcase has no zipper, making it easy to put on and take off for a unique and pleasant experience. Overall, the Slip Silk Pillowcase is a great investment for those who want to take care of their skin and hair while they sleep.
6. Silksoft Pillowcase – Beauty Sleep Essential (Brand: Silksoft, Category: Pillowcase)

Introducing our Pillow Cases, available in three sizes to accommodate any pillow. The Standard size measures 26 x 20 inch/50.8 x 66 cm, the Queen size measures 30 x 20 inch/50.8 x 76.2 cm, and the King size measures 40 x 20 inch/50.8 x 101.6 cm. These cases are not only functional, but also add an elegant touch to your bedroom décor, providing you with a good night's sleep.
Our Pillow Cases are crafted from 100% polyester, ensuring a soft and luxurious feel with a rich, elastic touch. The fabric is durable and strong, maintaining its shape and structure over time. These satin pillowcases protect delicate facial hair from scratches, creases, and tugs, reducing split ends, and promoting restorative beauty sleep, resulting in a happier life.
Cleaning the Pillow Cases is a breeze, as they can be machine-washed or hand-washed. However, it is recommended not to twist them too dry and to let them retain a certain amount of moisture. Drying them in the shade will prevent wrinkles. Please note that they should be washed in warm water less than 40℃, and bleach or other detergents should not be used.
Our Pillow Covers are perfect for use year-round, providing a cool body feel that maintains a comfortable body temperature in hot weather. As they do not absorb moisture, they are perfect for enjoying a restful night's sleep.
These Pillow Cases are not only suitable for women, but also for men, the elderly, and children. They make a thoughtful gift for birthdays, Valentine's Day, Christmas, Thanksgiving, or any special occasion. We recommend purchasing two or more to ensure that you always have a spare on hand.
7. Silk-Soft Satin Pillowcases – Set Of 2

Introducing the Satin Pillow Cover, a luxurious addition to any bedroom that not only looks beautiful but also provides a comfortable sleeping experience. This cover is made from 100% high-quality polyester satin, which is more durable and sturdy than silk and gives a distinctive lustrous appearance.
The silky satin pillowcases are designed to reduce friction, provide a perfect slip, and protect your skin. Unlike cotton pillowcases, these satin pillowcases create less friction, which helps to protect your hair and reduce hair breakage, making them perfect for those with curly hair. Moreover, they are cool in summer and warm in winter, making them suitable for year-round use.
Not only do these satin pillowcases help protect your hair, but they also benefit your skin. The hypoallergenic and non-irritating fabric helps to prevent sleep lines, reducing the chances of wrinkles over time.
The Satin Pillow Cover comes in a set of two slip pillowcases, without pillows included. The zipperless envelope closure design makes it easy to remove and fix the satin pillowcase, preventing hair from being pulled.
Taking care of the Satin Pillow Cover is a breeze. Simply turn the cover inside out and wash it by hand or machine with a mild detergent in cold water. Circulate it gently and cool iron to maintain its sheen. Do not bleach the cover.
8. Silk Bliss Bundle: Sleek & Hydrated Sleep!

Introducing the Blissy Silk Pillowcase, crafted from high quality 22 Momme 100% Pure Mulberry Silk, providing a luxurious and comfortable sleep experience. The handmade pillowcase has undergone rigorous prototyping, testing, and use to ensure the highest quality and durability.
Say goodbye to bedhead and tired hair with Blissy. The pillowcase prevents tugging and pulling, which is common with ordinary pillowcases. The non-absorbent surface of the silk pillowcase helps maintain the hair's natural oils, promoting healthier hair and reducing dryness and tangles.
Blissy offers more than just a good hair day, it also benefits the skin. Unlike other pillowcases that absorb vital skin nutrients, Blissy's 100% Mulberry Silk allows the skin to maintain balanced moisture levels, forming a protective layer. It is perfect for fighting against dryness and acne for a healthy-looking complexion.
For a better and cooler sleep, the Blissy Silk Pillowcase's temperature regulating properties keep you cool throughout the night. It eliminates discomfort associated with fluctuating temperatures and constant tossing and turning, allowing for a restful night's sleep.
If you suffer from allergies, the Blissy Silk Pillowcase is a game-changer. Cotton pillowcases can be breeding grounds for allergens, but silk is hypoallergenic. This means you can wake up with clearer sinuses, dry eyes, and breathe easier. For those with sensitive skin, the pillowcase reduces redness, puffiness, and blemishes, promoting healthier-looking skin.
9. Silk Pillowcase: Wrinkle-Free And Hair-Friendly.

Introducing the ultimate addition to your beauty and self-care routine, the Silk Pillow Case. This luxurious pillowcase is expertly crafted with the finest quality mulberry silk, renowned for its superior quality and softness.
Not only does the Silk Pillow Case provide a luxurious look and feel, but it also boasts a wide range of hair and skin benefits. The ultra-smooth fabric of the pillowcase helps prevent hair breakage and tangling, leaving your hair soft, shiny, and more manageable. Additionally, the pillowcase helps retain moisture in the hair, keeping it hydrated and healthy.
But that's not all! The Silk Pillow Case also works wonders for your skin. Its soft and smooth texture helps reduce the development of wrinkles and fine lines, keeping your skin looking youthful and radiant. The pillowcase also helps keep your face hydrated, making it a fantastic anti-aging product.
With its natural, non-toxic, and eco-friendly qualities, the Silk Pillow Case is a great alternative to harsh synthetic materials. Made from organic mulberry silk, it is free from any toxic additives that may cause allergies or skin irritations.
This versatile pillowcase is perfect for any setting, whether you want to enjoy it at home, in a hotel or hospital. It is also an excellent gift option, making it a great housewarming gift or present for someone special.
Upgrade your lifestyle with the ultimate luxury pillow case and experience the superior quality of mulberry silk. Order your Silk Pillow Case today and enjoy the benefits of soft and smooth hair and skin.
10. Silky Peach Cushion Cover For Luxurious Comfort.

Introducing the Peach Skin Pillowcase, a high-quality decorative cushion cover that is designed to keep your pillows clean and free from scratches and fingerprints. Made from durable peach skin material, this pillowcase is soft to the touch and suitable for both indoor and outdoor use.
Measuring 18" x 18", this pillowcase is designed to fit most standard-sized pillows. Please note that a filler is not included with the purchase. The pattern is drawn on one side only, making it a stylish addition to any room or outdoor space.
The Peach Skin Pillowcase features a convenient zipper that makes it easy to insert and remove your pillow. It is also machine washable or can be hand washed for easy cleaning. Please avoid using bleach and dry on low temperature to maintain the quality of the pillowcase.
This high-quality pillowcase is perfect for use in your living room, office, bedroom, or even on your terrace or in your car. Its soft and durable material ensures that it will be a long-lasting addition to your home decor.
Invest in the Peach Skin Pillowcase for a stylish and practical way to keep your pillows clean and protected.
Best 100 Silk Pillowcase FAQs
Are there any particular brands or types of silk pillowcases that are highly recommended?
Yes, there are several brands and types of silk pillowcases that are highly recommended for their quality and benefits. One of the most popular and well-known brands is Slip, which offers a range of silk pillowcases in different sizes and colors. Slip uses high-quality, 100% pure mulberry silk, which is hypoallergenic, gentle on skin and hair, and helps to prevent wrinkles and creases.
Another brand that is highly recommended is Fishers Finery, which also uses 100% pure mulberry silk and offers a range of sizes and colors. Fishers Finery pillowcases are OEKO-TEX certified, meaning they are free from harmful substances and safe for use.
Additionally, LilySilk, ZIMASILK, and Alaska Bear are also popular brands that offer high-quality silk pillowcases. When choosing a silk pillowcase, it's important to look for 100% pure mulberry silk, as this is the highest quality and most beneficial type of silk. It's also important to consider factors such as thread count, weave, and size to ensure you choose a pillowcase that meets your needs and preferences.
Are there any potential downsides or disadvantages to using a silk pillowcase?
While silk pillowcases are often lauded for their benefits to the skin and hair, there are a few potential downsides to consider.
Firstly, silk pillowcases can be quite expensive compared to other types of pillowcases, which may not be feasible for everyone's budget.
Secondly, silk pillowcases may require more delicate care compared to other types of pillowcases. They typically need to be hand washed or washed on a delicate cycle in a washing machine and air-dried, which can be time-consuming and inconvenient.
Lastly, some people may not find silk pillowcases as comfortable as other materials. Silk can be slippery and cool to the touch, which may not be ideal for those who prefer a more textured or warm pillowcase.
Overall, while silk pillowcases have many benefits, it's important to weigh the potential downsides and decide if they are the right choice for your needs and budget.
Can a silk pillowcase help with hair loss or thinning?
While a silk pillowcase may not directly prevent hair loss or thinning, it can help to reduce the amount of damage and breakage that occurs while you sleep. Silk is a smooth and soft fabric that creates less friction than other materials, such as cotton. This means that your hair is less likely to get tangled and pulled as you move around in your sleep, which can lead to breakage and damage over time. Additionally, silk is less absorbent than other fabrics, which means that it won't absorb the natural oils from your hair and scalp as much. This can help to keep your hair moisturized and healthy, which in turn can help to prevent breakage and thinning. Overall, while a silk pillowcase may not be a cure-all for hair loss or thinning, it can be a helpful addition to a healthy hair care routine.
Does the color of the silk pillowcase affect its quality or benefits?
The color of a silk pillowcase does not affect its quality or benefits. The benefits of using a silk pillowcase come from the properties of the silk material itself, such as its smooth surface that reduces friction and its ability to retain moisture and prevent hair breakage. The color of the silk is purely aesthetic and does not impact the quality of the material or its benefits.
However, it is important to note that the quality of the silk used to make the pillowcase can affect its benefits. Higher quality silk, such as mulberry silk, is smoother and more durable than lower quality silk, which can be prone to snagging and tearing. Additionally, silk pillowcases that are made with non-toxic dyes or are naturally dyed may be better for those with sensitive skin or allergies. It is recommended to choose a silk pillowcase made from high-quality silk and free from harmful chemicals for optimal benefits.
How do I care for my silk pillowcase to ensure it lasts a long time?
Silk pillowcases are luxurious and delicate, and proper care is crucial to ensure they last a long time. Here are some tips to help you care for your silk pillowcase:
1. Hand wash your silk pillowcase in cold water with a gentle detergent. Avoid using bleach or fabric softeners as they can damage the silk fibers.
2. Rinse the pillowcase thoroughly to remove all detergent residue. Do not wring or twist the silk pillowcase as it can damage the fibers.
3. Hang the pillowcase to air dry. Avoid direct sunlight and heat sources as they can cause the silk to fade or shrink.
4. Iron the pillowcase on a low setting if necessary. Always iron on the reverse side of the fabric to prevent damaging the delicate fibers.
5. Store your silk pillowcase in a cool, dry place away from direct sunlight. Avoid storing it in plastic bags as they can trap moisture and cause mold and mildew growth.
By following these simple steps, you can help ensure that your silk pillowcase lasts for many years and provides you with a comfortable and luxurious sleeping experience.
How does a silk pillowcase help prevent wrinkles and fine lines?
Silk pillowcases are known to prevent wrinkles and fine lines because of their smooth and soft texture. Unlike cotton, silk does not cause friction against the skin, which can lead to skin irritation, redness, and the formation of wrinkles. Also, silk is a natural fiber and does not absorb moisture from the skin or hair, which helps to keep the skin hydrated throughout the night. Furthermore, silk pillowcases are hypoallergenic, meaning they are less likely to cause an allergic reaction or irritation to those with sensitive skin. Finally, silk pillowcases do not absorb the natural oils from the skin or hair, which helps to maintain the natural moisture balance of the skin and prevent the formation of wrinkles. Overall, using a silk pillowcase can help to prevent wrinkles and fine lines and keep your skin looking youthful and healthy.
What are the benefits of using a 100% silk pillowcase?
Using a 100% silk pillowcase can have several benefits for both your hair and skin. Silk is a soft and smooth fabric that reduces friction and helps prevent hair breakage and split ends. This is especially beneficial for people with curly or textured hair that is prone to tangling. Silk also helps to retain moisture in the hair, preventing it from becoming dry and brittle.
In addition to its hair benefits, silk pillowcases are also gentle on the skin. Unlike cotton, which can be rough and absorbent, silk is non-absorbent and helps to retain the skin's natural moisture. This can help to prevent wrinkles and fine lines from forming, as well as reduce acne breakouts.
Silk pillowcases are also hypoallergenic and resistant to dust mites, making them a great choice for people with allergies. They are also easy to care for, as they can be machine washed and dried on a gentle cycle.
Overall, using a 100% silk pillowcase can provide numerous benefits for both your hair and skin, making it a worthwhile investment for anyone looking to improve their overall sleep experience.
What factors should I consider when choosing the best 100% silk pillowcase?
When choosing the best 100% silk pillowcase, there are several factors that you should consider. Firstly, you should consider the quality of the silk used. A high-quality silk pillowcase will be made from pure mulberry silk, which is known for its softness, durability, and hypoallergenic properties. Secondly, you should consider the thread count of the silk pillowcase. A higher thread count indicates a denser, more luxurious fabric that is less likely to snag or tear. Thirdly, you should consider the size and shape of the pillowcase. Silk pillowcases come in a variety of sizes and shapes, so choose one that fits your pillow snugly. Fourthly, you should consider the care instructions for the silk pillowcase. Some silk pillowcases require dry cleaning, while others can be washed in the machine. Lastly, you should consider the price of the silk pillowcase. While high-quality silk pillowcases can be expensive, they are an investment in your health and beauty routine, so choose one that fits your budget and lifestyle.
What is the difference between a 100% silk pillowcase and a satin pillowcase?
While both silk and satin pillowcases are known for their ability to reduce hair breakage and prevent wrinkles, there are a few key differences between the two.
Firstly, silk is a natural fiber, while satin is a synthetic material made from polyester or other similar materials. This means that silk pillowcases are more breathable and hypoallergenic, making them a better choice for those with sensitive skin. Satin pillowcases, on the other hand, may be more affordable and easier to care for.
Another important difference is the texture. Silk pillowcases have a smooth and luxurious feel, while satin pillowcases have a slightly slippery texture. Some people may prefer the feeling of silk, while others may find satin to be more comfortable.
Ultimately, the choice between a silk and satin pillowcase comes down to personal preference, budget, and specific needs. Both options offer benefits for hair and skin health, so it's up to you to decide which one is the best fit for you.
What makes a silk pillowcase the "best" choice for skincare and hair health?
Silk pillowcases are considered the "best" choice for skincare and hair health due to their smooth and soft texture. Unlike cotton pillowcases, silk pillowcases do not cause friction between the fabric and the skin or hair, which can lead to wrinkles, creases, and hair breakage. Silk also has natural moisture-wicking properties that help keep the skin hydrated and prevent dryness. Additionally, silk is hypoallergenic and does not attract dust mites or other allergens, making it an ideal choice for people with sensitive skin. Silk pillowcases are also known for their temperature regulating properties, helping to keep the skin cool and comfortable while sleeping. Overall, using a silk pillowcase can help promote healthy hair and skin by reducing friction, preventing wrinkles, and maintaining moisture levels.