A Gaiam exclusive, the balance ball chair combines exercise and fitness with comfort and ergonomic back support for an affordable price. With chiropractic pioneer Dr. Randy Weinzoff, Gaiam developed this patented BalanceBall Chair as an effective tool for strengthening core muscles and improving spinal alignment. Alleviates the aching back/legs/arms syndrome that comes from working at a desk for hours. Designed for people between 5-feet and 5-feet 11-inches tall, this unique chair employs the same balance ball used in your workout routine, but with it you also get an adjustable support bar, easy-glide casters, an air pump, and a desktop guide to help keep you moving. Designed by leading health and fitness experts, Gaiam back-care solutions build a healthier back, relieve pain, and improve your overall well being. The height of the back of the chair is 2.5 feet tall, and the base measures 20 inches wide from one side of the wheels to the other. The chair comes with 2 locking casters and 2 regular ones. The locking casters go on the back of the chair. Some assembly is required. The chair measures 21 x 31 x 22 inches (W x H x D) and weighs 13 pounds. It has a 300-pound weight capacity. Made in Taiwan. more info