Suitable SizesInflatable hot tub cover is 4.4Ft in diameter, which is compatible with most of our spa hot tub range.So please measure the diameter of your hot tub before ordering.Simple to Inflate: Since this hot tub cover has been manufactured to be quick and simple to inflate, it can be used within minutes to keep your hot tub clean and warm.Filtration: Energy saving lid for hot tub can effectively keep out wildlife and any lingering debris.It can also play a role in preventing dust, reducing condensation and freezing on the edge.Heat Retention: This bladder cover can not only effectively prevent water evaporation loss, but also maintain the water temperature and absorb the heat energy of the sun's rays to heat the water, reducing the time you need to heat the water next time.Save Money: This lid ensures that tub maintenance is minimal, while the cover prohibits items from the entering the water it also cut downs on the number of filters used.