Designed to give extra support. Quilted for added comfort, and specially treated to inhibit bacterial growth to provide protection against dust mite allergies. Corner straps hold the protector firmly in place. It helps to prolong mattress lifespan. 100% polyester filling. Face fabric 50% polyester and 50% cotton. Backing 100% polypropylene. Machine washable as synthetics at 40°C. Do not tumble dry. Line dry only.