AERIS Muvman Sit-Stand Stool (Green seat/Grey base) Impressive 20-33 seat height on the standard, and 23.5 - 36 on the tall lift seat height range supports the user at a healthy, perching seat height Muvman's dynamic strut situates the pneumatic lift 4 forward tilt for an active, supported-standing position Muvman sit-stand stool has received multiple design awards, including the prestigious 2011 RedDot Non-slip, non-scratch rubber base is suitable for all floor types