This is the inflatable ergonomic seat cushion that can be used to strengthen the core and improve posture while at home or in the office. The comfortable design engages muscles in the abdomen and the back to support the spine, while reducing pain by relieving point-of-contact pressure inherent in long periods of sitting. The firmness of the cushion may be controlled to adjust it to your fitness needs and sitting comfort. Can also be used to augment strength and balancing exercises in a chair or on the floor. Supports up to 300 lbs. Includes hand pump.