This comfortable and attractive design features heavy duty, heat resistant material and suction cups to prevent the seat from floating or moving.The firmness and size can be adjusted by the amount of water used. Easily filled with a standard garden hose.
 
This comfortable and attractive design features:

Heavy duty booster seat
Chemical resistant material
Four suction cups prevent the seat from floating or moving
The firmness and size can be adjusted by the amount of water used to fill it
Fill easily with a standard garden hose