The Posture Improving Exercise Ball Chair.

This is the backless chair with an exercise ball base that helps to improve your posture by gently exercising your core muscles. The polyester mesh outer layer houses a 16" diam. exercise ball--the same kind used by personal trainers and gyms for core strengthening and balance exercises--that rests on top of five steel feet with a chrome finish, providing a stable sitting surface while performing office work or watching TV, yet it is buoyant enough to force your abdominal muscles to engage, providing a low-impact, almost imperceptible workout that helps with spinal alignment. The exercise ball's pressure can be adjusted with the included hand air-pump. Please specify Black, Light Blue, or Red. 23" H x 16" Diam. (5 lbs.)