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. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!