The big office chair backrest and independent lumbar support gently wrap around your body ,support your lower back, thoughtfully designed for the big and tall office chair to keep you comfortable during long hours of working, studying, or gaming. Made of high-quality leather fabric, comfortable to touch, waterproof, stain-proof and oil-proof, easy to clean. Large sponge cushion, moderate softness and hardness, no collapse after sitting for a long time. Level 3 explosion-proof air pressure rod, international certification, authoritative quality test, safe and stable. Elegant and not overly-aggressive classic styling, along with true commercial-grade performance bring just enough fun to corporate board room, executive suite, and home office.