Product details:

The Gaiam Backless Balance ball chair greatly alleviates the aching back/legs/arms syndrome that comes from sitting at a desk for hours. Also helps to relieve pain and promote proper spinal alignment, posture, a healthier back, and overall well-being. Designed for people between 5-feet and 5-feet, inches tall, this unique chair is the same as the Gaiam Balance chair, but without the adjustable back support bar. Includes a removable 52-centimeter Balance ball, lockable easy-glide wheel casters and an air pump.