Sleep soundly on the cloud-like SHEEX Recovers Gen 2 King Mattress Protector. This hypoallergenic, breathable, temperature regulating mattress protector is the perfect addition to your bed. CoolX technical fibers prevent heat from building up around your body to keep you at your optimal sleeping temperature. Outer Surface: 87% Polyester, 13% Spandex. Fill: CoolX Fiber Fill: 100% Hypoallergenic Polyester. Large capacity washer and dryer are recommended. Machine wash cold separately on gentle cycle. Do not bleach. Tumble dry low. Do not iron.