The weighted base leverages your center of gravity to support various degrees of 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 which may help promote the optimal open hip angle compared to sitting; this angle potentially helps to engage the core muscles and enable posture perfection. Supports leaning posture – that may encourage a hip-to-torso range of 130 to 135 degrees which may allow for the least amount of pressure on your spine and connecting muscles. Easy-adjust piston-release handles raise and lower the seat, encouraging a range of postures from active sitting to leaning. Tri-flex seat cushion has built-in sitz bone contours for plush support and a waterfall edge that may help reduce pressure on the upper legs. Works with any standing desk/table and is rated up to 300 lbs. Accommodates user heights between 4'11" and 6'8".