The TheraGym SensaDome stability ball chair brings the benefit of movement and activity while sitting with complete stability. Offering innovative seating alternative for home, school, and therapeutic settings also helps improve posture and maintain muscle tone. Enjoy a stimulating and energy absorbing break from conventional seating. Latex-free stability therapy ball in a zip off washable cover. Covers are cold water washable (do not place in dryer). Durable steel base with molded, sturdy rubber feet. 300 lbs capacity. Small/Medium User Height is 34-45 inches.