You don't sit still, so your chair shouldn't either. The B300 PRO ergonomic office chair moves with you—its 4-way lumbar flexes, glides, and adjusts height to keep your lower back supported through work, meetings, gaming, or reading. The backrest adapts to your height, while the depth-sliding seat relieves thigh pressure and the breathable mesh keeps you cool and sweat-free. Weight-sensing recline delivers smooth, natural resistance without knobs. A 3D headrest cradles your neck, and 6D armrests twist, slide, or flip up for any sitting style. Built to BIFMA, SGS, and TÜV standards, backed by a 3-year warranty and 30-day returns, with 24/7 support—this mesh office chair is your all-day comfort companion for work, study, and play. | Sihoo | | B300 Pro Ergonomic Mesh Chair, 6D Armrest, 3D Headrest Office Chair for Adult, Seat Depth, Home & Gaming, 330lbs | Gray | Best Buy