Save energy by keeping the heat in with the Lay-Z-Spa 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 square spas with lengths of 2.01 m (79 in.) and heights of 80 cm (31.5 in.), the Lay-Z-Spa EnergySense Thermal Spa Cover will help you save money on energy costs by keeping your spa at a steady, toasty temperature.