FITS ALL BRANDS OF INFLATABLE HOT TUBS UP TO 70 INCHES IN DIAMETER! Make your Inflatable Hot Tub up to 50% more energy efficient with the easy-to-fit, Universal Small Round Thermal Hot Tub Cover that will immediately cut your Hot Tub bills! Suitable for all brands of Small Round Hot Tubs up to 70 in Diameter, our CleverSpa Universal Thermal Hot Tub Cover improves heat retention due to the thermal insulation making it up to 50% more energy efficient - saving you money! With improved energy efficiency, using your Inflatable Hot Tub all year round couldn't be easier, and is now more viable. All CleverSpa Universal Thermal Covers feature a removable zip-off door, in order to accommodate hot tubs with or without an external motor, making it the versatile solution for any 4 Person Round Hot Tub, from any brand! The Thermal Cover's webbing straps and locking clips provide a safe and secure fit. The Thermal Cover is waterproof to HH 118 in, as well as UPF 50+ providing protection from extreme weather conditions. Our CleverSpa Universal Thermal Hot Tub Cover: Small Round - Fits Up to 70 inchesDiameter is compatible with any Round, 4 Person Lazy Spa, M Spa & Wave Spa Hot Tub. We highly recommend using with the CleverSpa Inflatable Cover Support to stop rainwater pooling. NOTE: The CleverSpa Universal Hot Tub Thermal Insulation Cover is packaged inside out. Turn the correct way around, placing the logos on top to ensure the thermal cover is waterproof. Exposure to direct sunlight will cause the Universal Thermal Hot Tub Cover to fade over time.