This down alternative mattress pad uses a HeiQ Smart Temperature regulating treatment to help maintain a balanced temperature by retaining body heat when you''re cold, or wicking away moisture to cool you off when you''re hot. Waterproof fabric; Machine Washable The microfiber mattress pad is also OEKO-TEX certified, meaning it does not contain any harmful substances or chemicals to ensure quality comfort and wellness. Bedding comes in rolled or compressed. Simply unbox, unroll, and the mattress pad does the rest by expanding to its original shape within 72 hours. Fits up to 18" deep mattresses.Twin: 39"W x 75"L + 15"DFull: 54"W x 75"L + 15"DQueen: 60"W x 80"L + 15"DKing: 78"W x 80"L + 15"DTop: 100% polyester microfiber with HeiQ temperature regulating treatmentFilling: 100% polyester fiber fillingBack: Non-wovenBottom: Non-woven with waterproof laminatedSkirt: polyester knitFeatures:Microfiber with HeiQ smart temperature regulating treatment, retains body heat when you are chilly, cools you when you are hot Helps to maintain a balanced temperature day and night Waterproof for extra protection Moisture wicking Fits up to 18" mattresses Classic diamond quilting Machine washable Oeko-Tex Certified, includes no harmful substances or chemicals