Jobri BetterPosture Standard Kneeling Chair &ndash; Kneeler Chair &ndash; Ergonomic Kneeling Chair for Back Pain STURDY. Black steel frame supports users up to 250 lbs. SMOOTH-ROLLING. Nylon casters allow this chair to be rolled easily, even on carpet. UPRIGHT. Eases the hips forward, encouraging proper posture, and aligning the back, shoulder and neck to ease discomfort and pain. SUPPORTIVE. Shifts the users body weight to the leg muscles, which are better able to support it. ADJUSTABLE. Height ranges from 21 to 28.5 and is easily adjusted.