Lifespan Fitness DM9 Ergonomic Mesh High Back Office Chair Seller:ActiveGo friends and families can enjoy friends and families can enjoy building together Experience the next level of external storage promoting proper posture and reducing strain on your back and shoulders General Ridge Shaped Bionic Back Rest with Durable Mesh Back Height Adjustable Lumbar with U Shaped Support Back Rest Tilt from 90 Degrees to 120 Degrees Lockable Back to 4 Settings Adjustable Seat Height with Class 4 Gas Lift High Mesh Back with Adjustable Head rest (Tilt & Height) 360 Degree Running Nylon Castors Seat with Moulding Foam and Seat Depth Adjustable Class 5 Waterproof and Class 6 Oil Resistance BIFMA Certified ensuring it meets industry stnadard for safety