This unique durable mesh cover turns a stability ball into a comfortable active seat with handles! Its self-righting design prevents the ball from rolling away, and combined with the padded top, ensure a proper, cushioned seat in seconds! Simply insert the included ball into the cover, inflate, and secure the Velcro® slit for an instant active seat that allows users to improve posture and coordination as well as strengthen their core. Two side handles make it easy to transport and also give hands a designated place when sitting. Cover fits a 55 cm stability ball and fits Jr high students or students between 4'8" and 5'4"H. Set includes 1 ball and cover.