Build strength in your back and core by sitting up straight without the support of a chair and wobbling gently while you sit. Dynamic sitting emulates the frequent posture changes we make while standing which naturally tone our muscles. The weighted base provides great traction on various surfaces for a wide range of motion while seated.Without lowering your desk, perch on the ErgoStool for a low-impact break from standing. Giving yourself the option to take quick breaks with no hassle encourages you to stand for longer.With a 10-inch height-range, the ErgoStool can also be used at a regular desk. It enables you to sit comfortably without putting pressure on healthy circulation in the legs. Size: W 13.5" / D 13.5" / H 24.5". Color: Blue. Material: Polypropylene.