Active Collection FWS-1000-BK Pivot Stand-up Leaning Seat , Matte Black Active seating supports leaning posture that encourages a hip-to-torso range of 130 to 135 degrees Tri-Flex Seat Cushion with sitz bone contours and waterfall edge, seat pan supports leaning posture Pivoting seat leg empowers you to move 360 degrees, weighted base with rubber Octogrip Overmold provides full range of motion while maintaining control Easy-adjust piston-release handles raise and lower seat height from 26" to 35 1/2"H, rated up to 300 lbs. Designed by Martin Keen, pair with the Stabilizing Foot Rest Model FFR-1000 (sold separately)