Product description Click to play video Working & Gaming Chair The 4-inch adjustable height, 90 - 135 degree adjustable backrest, retractable footrest and soft cushion-linked armrests enables the gaming chair to accommodate different heights and usage preferences; It can disperse 95% of body pressure and relieve long-sitting fatigue, applicable for work, gaming or rest. Pocket Spring Cushion & Massage Lumbar Support The 19.7 -inch thickened and widened backrest, along with 30D one-piece molded high-density memory latex headrest and massage lumbar support and top pocket spring seat cushion, follows ergonomics. Click to play video Massage Lumbar Linkage Armrest Thickened Cushion Adjustable Backrest Is the backrest adjustable? What is the chair's weight capacity? How comfortable is the chair? Is the assembly process straightforward Is the chair sturdy and stable?