For prolonged periods of sitting, it is important that it be done comfortably with good posture. The National Institute of Health recommends choosing a chair with all the necessary adjustments to support proper posture. This includes:– Chair with casters and five-point base– Seat rest with dense foam padding– Backrest with lumbar support– Armrest with adjustable height and width– Seat height hydraulic adjustmentChair recline and tilt function4D ADJUSTABLE ARMREST4 directional height, width and 4-direction adjustable for optimal support of the forearm to relieve wrist pressure and muscle strain.ADJUSTABLE BACKAllows for effortless adjustment of back angle up to 160 degrees for optimal sitting position during general and gaming use.Z SUPPORT MULTI FUNCTION TILT MECHANISM WITH LOCKING SYSTEMProvides adjustable tilt for increasing and decreasing tension by matching the body weight of the user for effortless, secure and sturdy rocking, without putting fatigue on muscles.POWERFUL CLASS-4 GAS PISTONGives easy height adjustment of the seat for optimal ergonomic support for both posture and back stress prevention. User can adjust height for optimal support based on environment.STURDY 5 STAR ALUMINUM BASEBy using a premium grade aluminium base which is designed to support a max load of 120kg, the chair is more durable and long-lasting compared to it’s nylon based counterpart. With internal structured design and a 70cm (25”) width it is also more stable and solid.LARGE 3” CASTER WHEELSUse of large 3” caster wheels provide enhanced base support whilst in use. Wider wheel base also provides quieter operation and further adds to the stability of the chair with even greater freedom of movement.Specifications: