The inner layer of this air heater is treated with environmentally friendly PU waterproof coating, and the outer layer is made of thickened 600D oxford cloth, which has high material density and wear resistance. The lid can withstand more than 15,000 water pressures. When it rains, the water slides quickly and does not penetrate the lining. [General Size] The heater cover has a diameter (dome) of 33 inches * 89 inches high * 19 inches in diameter (base) to provide all-round coverage from top to bottom. Universal design fits most garden heaters. Please measure your patio heater before purchasing. Our 601D heater covers feature high-density stitching, excellent water resistance and durability. Waterproof zippers provide optimal waterproofing to keep garden heater covers in condition. This outdoor heating hood features a full-length solid zipper that is easy to put on and take off, making it easy for one person to complete. What's more, the bottom-adjustable drawstring design can better wrap the outdoor heater without worrying about high winds and snow. This upgraded lid provides perfect protection for outdoor heaters from top to bottom.