Experts agree that we need to strengthen, not “support” our bodies. On an ErgoErgo Accordion Stool, your body feels at ease and strong. Engage your core muscles, keep your spine supple, improve your circulation, and ease your breathing! ErgoErgo is made of black UV-stable recyclable techno polymer and can be used indoors and outdoors! Weight load up to 225lbs or 250lbs with the Wide size. For ages 9+. <br> <br> Diameter : 19.5" Weighs: 13lbs. Seat Height: 20.5"