This saddle seat helps you replicate an equestrian's healthy posture to reduce back fatigue and discomfort while seated. Its gentle forward slope shifts the pelvis forward and raises the buttocks above the knees, resulting in semi-standing posture that discourages slouching--major causes of back discomfort. The sides of the seat are also sloped, spreading the knees apart (hip abduction) and keeping the pelvis upright to reduce stress on the back, shoulders, and neck. Unlike traditional chairs that can restrict blood circulation in the legs, the saddle seat does not exert contact pressure on the back of the legs, reducing muscle fatigue. The chair swivels 360º and has five casters for optimal mobility and stability, its polyurethane foam seat is soft yet supportive, and it has a durable polished aluminum frame. With tilt- and height-adjustment. Supports up to 280 lbs. 21"-28" H x 17" W x 14" D. (17 1/2 lbs.)