FULLWATT ergonomic body-hugging design for natural curvature of a person's back, soft PU high back which can be locked at any angle between 90-160 degree. Height adjustable seat, sideways rotatable and adjustable armrest, with removable lumbar support，extend footrest makes this office chair not only for daily work or intensive gaming, it’s also rocking for finding your most comfort position while working, gaming, napping or relaxing, no more back pain or fatigue for long time gaming or working! Features: -Back tilt Locking mechanism 90-160 degrees angle adjuster -Adjustable Massage lumbar cushion,connect USB to start massage function -High-quality five star base with Smooth-rolling casters -Premium high density foam and PU leather material -Height-adjustable gas spring cylinder -Orthopedically and ergonomically designed -Load capacity up to 330 lbs -Ultra-strong and sturdy footrest Specification: - Color: Black & Red/ Black & Blue/ Black & Gray - Overall Size: 70L x 70W x 114-122H cmAdjustable Height - Seat Size：53 x 53 - Back Size: 53 x 76 - Height from ground to seat: 41.9 - 50 cm - Bearing Capacity: 330 lbs Package includes: - 1 x Racing Chair - 1 x Installation instruction - 1 x recline back - 1 x Massage lumbar cushion - Hardwares