The silk sleep mask is cut from the finest mulberry silk, using long and fine fibers with a 600 thread count (28 momme). Renowned for its durability, natural sheen, and exceptional softness, the silk sleep mask ensures comfort for a long night's sleep. 100% mulberry silk (28 momme) OEKO-TEX 100 certified Free shipping & exchanges Don't love the silk sleep mask? We'll take them back within 30 days and give you a full refund (if the package remains unopened)