Humanized lumbar backrest, fit the human body curve, give comfortable support to the spine. 90-150 degrees large angle backrest adjustable, one key control, so you can better relax. Thickened soft cushion, relieve the pressure of the buttock fabric, natural fit and relaxation. Hidden pull-out footrest, 35cm wide footrest, comfortable to put your feet. Integrated design of the chassis, steel plate is 2mm thick. Steel pneumatic lever, smooth lifting and lowering. Safe and stable.