Durable: Hardness and size can be adjusted by the amount of water used, durable. Heavy-Duty Heat-Resistant: Durable PVC material, its firmness and size can be adjusted by the amount of water used. Ergonomic Design: Spa cushion has comfortable and attractive design,suitable for all spas and hot tubs. This Bath Pillow Does Not Fall Off Your Bath Tub : Easily filled using standard hose nozzle or fill by jets in spa, suction cups prevent seat from floating or moving. Like Leaning Back Into A Warm Hug: The ultra-soft, thick padding of bath tub pillow gives way to cushion your head while the longer back support of this spa pillow for bathtub adds the perfect comfort for your back and shoulders.