HELPS KEEP YOUR BODY MOVING: Safco Zenergy Ball Chair provides an active seating experience that helps encourage good posture, core muscle strength and may help increase concentration. ENCOURAGES BETTER POSTURE: Designed with an anti-burst exercise ball and four legs for stability and durability, Zenergy offers the posture benefits of a yoga ball without the rolling. These benefits may include better balance and concentration. CHOOSE YOUR ALTITUDE: Each Zenergy ball chair lets you select one of two heights by installing just the feet for a sitting height of 20" or both the legs and the feet for a sitting height of 23" or both options are included. GREENGUARD Certified products are scientifically proven to meet some of the world's most rigorous, third-party chemical emissions standards, helping reduce indoor air pollution and the risk of chemical exposure to help create healthier indoor environments DIMENSIONS: Overall (Leg Option): 23"H x 22.5"D x 22.5"W. Overall (Feet Only Option): 20"H x 17.5"D x 17.5"W. Product Weight: 15 lbs. Maximum User Weight Capacity: 250 lbs. Manual pump included.