Size There are 3 sizes available. Fits most round hot tubs on the market. Please check the detailed dimensions in the pictures. We recommend measuring your hot tub to choose the correct size. Material Our outdoor round hot tub cover is made of 210D Oxford fabric with an inner silver coating. Durable waterproof jacuzzi cover. Waterproof, snowproof, dustproof, and lightweight, keeps your outdoor round hot tub dry and clean. Windproof Design The spa cover features a drawstring design on the bottom of the cover to keep the cover secure on windy days, with cord locks for added security to prevent it from blowing away. Fully Cover Hot Tub Design The round hot tub cover fits completely over the entire tub and also covers the heating element/motor, helping to reduce heat loss around the motor. At the same time, it helps retain water temperature. Easy to Clean & Storage You can hose it down with water and let it dry in the sun. Comes with a storage bag for convenient storage. Package includes 1 x Hot Tub Cover + 1 x Storage Bag. NOT including hot tub or other items.