Two Uses: Floats and Seats. When you use it as a float for the kids in the water, make sure to inflate the air into it; When you use it as a seat in the bathtub, you can only inflate water inside it, so that you can seat very well. High Quality Material and Durable: Made of PVC, which is heavy-duty heat resistant material. Firmness and size can be adjusted by the amount of water used, comfortable and attractive for both adults and children. Easy to Use: Easily filled using standard hose nozzle or fill by jets in spa. The suction cups prevent booster seat from floating or moving of your hot tub seat. Applicable places: bathtub, inflatable swimming pool, SPA, etc.Comfortable and attractive design,suitable for all spas and hot tubs?comfortable and attractive for both adults and children. Size(L x W x H):about 18.5x14.57x5.91inches. Package included: 1pc x massage cushion. We will provide 24/7 fast reply if you have any questions.