4 Suction Cups: Easily fills with a standard garden hose or fills with jets in the spa. Suction cups prevent the seat from floating or moving. Adjustable Design Heavy duty heat resistant material. Firmness and size can be adjusted depending on the amount of water used. Package includes 2 cushions. Dimensions: Approx. 47 x 37 x 15 cm. Note: Please make sure that when using these seats, your spa water is chemically balanced. Comfortable and attractive, it is the perfect choice for enjoying spa time. Note: Please make sure that when using these seats, your spa water is chemically balanced. If the balance is exceeded, the product may not adhere to the surface.