A78 Autonomous ErgoStool Height-Adjustable Active Sitting Office Chair Ergonomic Standing Desk Swivel Stool Blue By Vifah Build strength in your back and core by sitting up straight without the support of a chair and 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.. Warranty 1 year against manufacturer defect. Height-adjustable stool perfect for standing or sitting desks. Sloping edges keep pressure from hindering circulation in the legs. Stable weighted base allows a wide range of motion to improve core and back strength. Exterior main shell of Polypropylene in black. High-pressure pneumatic 250mm range height-adjustable gas spring. Gas lift tested to 298 lbs.. Upholstered seat pad in fabric on Polyurethane foam. 13.5 13.5 24.5 min 34 max inches LWH . Easy and very fast to assemble. Office Chair 1