Supports your feet and encourages movement to ensure good ergonomic posture, so you can sit comfortably all day long. Promotes movement with the active motion function, which allows flexible platform movements. Light or heavy tension settings to adjust ease of movement. Two height settings for sitting and standing. Change height positions with effortless foot adjustment. Stylish design, made to last with a 5 year warranty. Tested by FIRAInternationalLtd to meet the ergonomic requirements set out in European health and safety legislation: EN ISO 9241-5.