Our sleep mask is made of 100% mulberry silk exterior and 100% silk filling on the inside making it lightweight for comfort around the eyes and smooth for comfort on the skin. Attached is an adjustable elastic strap which is also wrapped in silk. Dual achor points have been added to reduce pressure across the eyes. This 100% silk contains no synthetic materials and has a feel which is unparalleled. Silk's natural amino acids promote the rehydration of your skin. Enjoy the benefits of 100% silk.