Our 100% Mulberry SILK custom fitted pillowcase is OEKO-TEX® Certified free of harmful substances. It is a luxurious 19 Momme weight… which is the perfect thickness for laying your face and hair on. Great for keeping skin “wrinkle-free” and ‘bed head’ away! Mulberry SILK is produced by a rare species of silkworms that feed on mulberry leaves and is considered to be the softest silk available It is an extremely strong, naturally odorless, hypoallergenic and highly breathable fabric. Air moves through the fabric which means new oxygen is passing by your skin throughout the night.