Save energy by keeping the heat in with the SaluSpa® EnergySense® Thermal Spa Cover. This special spa cover is designed to insulate your spa with a double layer of heat protection, making it as much as 40% more energy-efficient. Featuring a DuraPlus™ waterproof surface material, this cover stands up to weather elements and wear from regular use. The zippered door on the side is perfect for a built-in pump or an external pump connection. Compatible with round spas with diameters of 93 in. (2.36 m) and heights of 28 in. (71 cm), the SaluSpa EnergySense Thermal Spa Cover will help you save money on energy costs by keeping your spa at a steady, toasty temperature.