Enhance the energy efficiency of your inflatable hot tub with the Lay-Z Spa EnergySense Square Thermal Hot Tub Cover. This thermal cover features a double layer of insulation that helps the hot tub retain heat and allows water to heat up more quickly, potentially reducing energy costs by up to 40%. Constructed from durable three-ply UV-resistant and water-repellent DuraPlus material, the cover is strong and resistant to the elements. It boasts double-stitched seams for added strength and improved impermeability. The thick internal layer of insulating cotton and the anti-mildew-treated interior work together to minimize heat loss. Safety lock clips and an adjustable strap ensure a snug and secure fit, even in windy conditions. The cover includes a zippered door designed for built-in pumps, and it can be easily removed to accommodate external pumps. Compatible with square spas up to 1.80 m x 1.80 m x 71 cm.