Keep the heat in, save energy and make your hot tub up to 40 prozent more energy efficient with the Lay Z Spa EnergySense Thermal Hot Tub Cover. This insulating hot tub cover offers a double layer of thermal insulation, making your inflatable hot tub up to 40 prozent more energy efficient. The Lay Z Spa thermal cover improves heat retention and allows you to heat the water much quicker. The Lay Z Spa thermal hot tub covers are made from ultra strong 3 ply UV resistant and completely water repellent Duraplus material, the same as our hot tubs, and have double stitched seams making them stronger and more impermeable. They reduce hot tub heat loss with a thick layer of insulating cotton and an anti mildew treated interior.