Ensure a comfortable, supportive seat during those long work hours. The Ultimate Core Balance Ball Chair from Gaiam will benefit you by improving your posture, spinal alignment, and core strength. This exercise ball desk chair provides ergonomic support to your neck and back and encourages proper posture by incorporating a latex-free, anti-burst fitness ball. The ball sits in the well of the chair and is held securely in place with a guard on the front of the chair. Easily remove the multi-functional, 52-centimeter ball to use as a piece of exercise equipment to stretch or complete low-impact workouts. Constructed with lightweight and sturdy PVC, the ultimate balance chair features 5 sturdy lockable caster wheels so you can swivel, roll, and move easily in your home or office. This fitness office chair is best suited for people between 5 feet and 5 feet 11 inches tall who weigh under 300 pounds. Say good-bye to back pain and discomfort on the job with the Gaiam Ultimate Core Balance Ball Chair.