Fill your work space with vibrant energy that also brings a sense of calmness with the Zenergy Ball Chair. Designed with an (anti-burst) PVC exercise ball that is covered in 100 percent polyester mesh and won't roll away, your seating experience can come alive. Design allows a little zip in your sit by providing movement that not only helps you sit comfortably, but also helps you concentrate and supports better posture and balance. Movement keeps your mind open while keeping your body actively engaged while you're problem-solving or casually conversing. This active engagement can potentially help strengthen core muscles and allow natural fidgeting that studies have shown to help increase calorie burn. Use this 17-1\/2 diameter, innovative seating as a complementary chair to your everyday seat. Weight capacity is 250 lb. The Zenergy Ball Chair is accented with four powder-coated steel legs and stationary glides and includes a pump to help you inflate to a better state of mind."