It is made of supper soft fibre and high quality cocoon fibre. Pillow’s super soft fiber and high-quality silk from the merger makes soft and comfortable, promotes sleep, has good power and temperature of the cold, as well as anti-mite, anti-bacterial, anti-allergy and skin-friendly features. Silk protein contains the external called "pro-power side-chain amino acid" is a substance that can absorb moisture in the air, and add the exclusion, the maintenance is dry, to maintain a comfortable, particularly useful for rheumatic diseases.