Pivot Seat by Focal Upright features easy-adjust, piston-release handles to raise and lower the seat, allowing the widest range of postures from active sitting to leaning. Tri-Flex Seat Cushion has built-in sitz bone contours and a waterfall edge for plush support and may help to reduce pressure points. Active seating supports leaning posture, encouraging a hip-to-torso range of 130 to 135 degrees, which provides less pressure on your spine and connecting muscles when compared to standing. The weighted base leverages your center of gravity to support multidirectional use. Rubber Octogrip Overmold grips on bottom of base and enables you to enjoy a full range of motion while maintaining control. Pivoting seat leg empowers you to move 360 degrees. Seat pan is positioned forward to help promote an open hip angle that may help engage the core muscles. Pivot Seat works with any standing desk/table and is rated up to 300 lb. It accommodates user heights between 4'11" and 6'8".