Aller-Free Balance Temp Knit Mattress Protector, King 100% Polyester Imported Soft knit top fabric with temperature balancing phase change material that will absorb excess heat from your body to keep you at your ideal temperature The breathable whisper quite back fabric will protect your mattress from stains and spills For added protection we've added an anti-microbial feature to prohibit dust and allergens Perfect fit power skirt adjusts to all mattress types, pillow top and foam, and will fit mattresses up to 22-inches King protector measures 78-by-80 inches