Improve posture anywhere with an inflatable vinyl disc that strengthens core muscles while you sit. A bumpy, grippy bottom side prevents it from slipping. A subtle texture on top provides a soft, sensory-rich experience while sitting on chairs or the floor. Includes an air pump to inflate the disc to desired thickness. Supports up to 220 lb. 13" dia x 1" thick; 1-1/2 lb. Ages 3 and up.