This fitted mattress pad will insulate, protect, and make your mattress more comfortable. Body oils from sweat will harden your vinyl watermattress and damage it. It is highly reccomended by all manufacturers that one be used. It will also reduce energy cost. This is a plush, machine washable, hypo allergenic, quality pad with quilted sides. Fits conventional size beds, and hardside waterbeds. 50/50 poly/cotton top with 10 oz. poltester fill.   Free Shipping!