100% Polyester TWO IN ONE SOLUTION - One layer serves as both a cozy mattress pad and waterproof mattress protector. It adds a plush quilted layer for your comfort and waterproof protection for the mattress. ADVANCED TECHNOLOGY - If something does get on the Serta mattress pad, its Scotchgard Stain Release protection helps stains come out in the wash. Unlike crunchy vinyl covers, the waterproof layer is whisper quiet and is attached to the back so everything stays together in the wash EASY INSTALLATION - The Simple-Fit stretch skirt fits mattresses up to 18 in. deep so it’s easy to put on, and elastic around the bottom edge helps keep the skirt in place. The deep skirt makes it easy to cover the mattress plus any enhancements, like a foam topper or feather bed STAYS CLEAN & FRESH - Hypoallergenic treatment helps inhibit the growth of odor causing irritants in the mattress pad between washings, ideal for those who sleep with pets or perspire a lot. Nobody likes a funky bed! CONVENIENT CARE - The compact size makes it easy and fast to launder at home. Simply machine wash cold and tumble dry low, following the instructions on the tag. Always use common sense and don’t cram a too large pad into a too small washer