Thermal Hot Tub Cover: The hot tub insulation cover is made of 170G top polyethylene material, providing excellent thermal insulation that helps reduce heat loss, save energy, and minimize your electricity bill, making it an eco-friendly option for your hot tub. Powerful Functions: Our thermal hot tub covers protector can protect your hot tub from dirt, hot sun, dust, rain, hail, bird droppings etc. Hook and Loop Closure: The hot tub thermal cover is easy to put on and take off. Extra install door design makes customer very easy to install it and make the cap tighten. It is Ideal for all square inflatable hot tubs. Wind Belt Design: Two stainless steel D-lockers are very easy to be loosed or tighten, it won't break. Our insulating hot tub cover allows adjustment for a tight in a harsh environment to prevent blow off. Warm Tips: The spa thermal hot tub covers are on the sides instead of the top. If there is insulation on the top, it will not be waterproof. The cover not be used by itself without an insulated hard cover under it.