The Chattanooga Hydrocollator Protective Cover is designed to be used in conjunction with the Chattanooga Original Hydrocollator Moist Heat HotPac. Choose either a foam filled terry cloth or a standard terry cloth; both coverings help insulate heat and provides protection from excessive heat exposure. The foam filled terry cloth is constructed with a layer of polyurethane foam between 2 layers of heavyweight terry cloth, allowing for repeated machine washing and drying. Foam filled protective coverings are intended for light clinic use or therapy at home. It's available with or without built-in pockets that secure the HotPac within, preventing unwrapping or slipping.