SIHOO B300 Pro Ergonomic Office Chair with Footrest, 4D Lumbar Support | Adjustable Backrest ＆Seat Depth, 6D Flip-Up Armrests, 3D Wide Headrest, Breathable Mesh, for Long Work Sessions, Light Grey

ADJUSTABLE LUMBAR SUPPORT THAT MOVES WITH YOU Long hours at your desk can leave your lower back tense and unsupported. The B300 PRO ergonomic office chair uses a spring-assisted 4-way lumbar system that adjusts in height and glides forward independently. It also flexes your body to maintain steady contact as you move. Lean forward for focused work, sit upright through meetings, or recline to recharge. The lumbar support follows every shift, helping ease pressure and keep you comfortably centered from morning to night. RAISE THE BACKREST. FIND YOUR FIT. Most chairs force your body to adapt to a fixed backrest. The B300 PRO does the opposite. Its independently height-adjustable backrest lets you position the lumbar support where your lower back needs it. This creates a more natural sitting position and fuller back contact for users of different heights. Whether you’re working through a deadline or leaning back to unwind, this ergonomic chair delivers a personalized fit that feels stable, balanced, and effortless. SIT DEEPER. STRETCH FARTHER. A seat that does not match your leg length can create unwanted thigh pressure and make long hours feel even longer. Adjust the seat depth to create a better fit and fuller thigh support. When it is time to unwind, pull out the retractable footrest and elevate your legs to help ease pressure. Work through a deadline, read, game, or take a well-earned break. The breathable mesh seat keeps air moving, so this desk chair helps you stay cool and comfortable from start to finish. RECLINE, STRETCH OUT, RESET Switching from focused work to a well-earned break should feel effortless. This computer chair uses a smart weight-sensing recline mechanism to match resistance to your body weight—no manual tension adjustment needed. Lean back smoothly, extend the footrest, and stretch out whenever you need a reset. Whether you’re taking a quick break, watching a movie, or relaxing between tasks, the chair stays balanced and supportive as your body settles in. FULL-BODY SUPPORT FROM HEAD TO TOE True comfort should support more than your back. The oversized 3D headrest adjusts to cradle your neck during long video calls, reading, or relaxed reclining. The 6D armrests rotate, slide, lift, and flip up to support typing, creative work, or sitting cross-legged. Pull out the retractable footrest whenever your legs need a break. Whether you use it as an everyday office chair or an after-hours gaming chair, the B300 PRO keeps you comfortably supported from head to toe. BUILT TO LAST. BACKED BY SIHOO. Built with premium materials and rigorously tested to meet BIFMA, SGS, and TÜV standards, the B300 PRO is designed for dependable daily use. Every chair comes with a 3-year warranty and 30-day hassle-free returns, giving you confidence from day one. If you need help, our dedicated customer support team responds within 24 hours with fast, reliable assistance. Choose with confidence and enjoy lasting ergonomic comfort every day.