HELPS PROMOTE BETTER POSTURE. Designed with a rubber-molded anti-skid base for use on all floor types, it offers the posture benefits of a yoga ball without the rolling. It helps promote movement by leaning, bouncing and swiveling during your workday. EXTERIOR MATERIAL. Choose polyester mesh or easy-to-clean vinyl in a variety of vibrant colors to cover the outside of the ball chair. Vinyl choices offer simple wipe-down cleaning. LOW PROFILE DESIGN. Weighing only 13. 5 lbs. , this anti-burst swivel ball chair supports up to 250 lbs. Its low profile design allows it to fit neatly under work surfaces when not in use. DIMENSIONS. Overall: 23"H x 17.5"D x 17.5"W. Maximum User Weight Capacity: 250 lbs. Manual air pump included. Assembly required.