【Ergonomic Office Chair】SIHOO M102C computer chair offers proper support for your head, back, hips, arms, and waist. It allows easy adjustments for seat height, headrest, lumbar support, and flip-up armrests, suitable for scenarios like work, relaxation, study, entertainment, and extended sitting. 【Separated Adjustable Lumbar Support】The premium mesh lumbar support of this SIHOO office chair optimizes ventilation and heat dissipation while offering precise relief for your waist's pressure. The 6cm (2.36") vertical adjustment range ensures customizable comfort, even during extended work hours. 【Adjustable Flip-Up Armrests】This big and tall office chair's adjustable flip-up armrests can move back and forth and pivot left and right, offering support to your arms and elbows as you work. Additionally, you can slide this ergonomic chair for home office under your desk to optimize space usage. 【Enhanced Wide, Soft Cushion】Our ergonomic office chairs comfortably supports up to 300 lbs (136kg) with a broader and more spacious design, ideal for diverse body types, a perfect office chair for tall people. The premium sponge reduces hip and tailbone pressure for prolonged sitting comfort. 【Easy Assembly, 3-Year Warranty, 30-Day Price Protection】SIHOO prioritizes superior service. Our M102C is TÜV-certified and meets US SGS BIFMA durability and safety standards. Enjoy complimentary parts within the 3-year warranty and swift 30-day issue resolution. Contact us for exceptional support.