All of our pillows use shells that are made of pure 100% mulberry silk, 25 momme, grade 6A, and Oeko-Tex Certified standard 100 (This latter point emphasizes  that the dyes used in our silk are free of harmful chemicals). To complete our products, we also manufacture all of the silk pillows and bolsters cases. Proper filler choice is a key component in providing comfort; therefore, we carefully pick filler that is hypoallergenic, made in the U.S.A., and has discrete shapes to ensure that the filler for your pillows and bolsters will distribute evenly and resist clumping.