The hot tub booster inflatable seat cushion (2 pack) offers an alluring design for ultimate relaxation. The curved design enables elevated seating by approx. 3-5 inches in your spa, whilst providing additional comfort. It can also be used as back support and elevate hips and legs for exercise. Manufactured from heavy-duty waterproof material and can be filled with water from a standard hose nozzle ready to submerge and use.