Back: Arc-shaped ridge-mounted double fan-shaped back frame, the double-fan back frame can be adjusted up and down and locked in 2 stages of inclination, which automatically adheres to both sides of the spine, fully supports the back, and makes sitting more comfortable Waist: Double-back L-shaped, supporting every spine and reducing the pressure on the lower back Armrest: rotatable, liftable, slidable back and forth Fabric : type C, D back and seat ( high-quality leather) Dual-Backrest System makes dynamic sitting by allowing freedom of movement in any position. Dual-Backrest System reduces fatigue and alleviates back pains associated with long sitting. Body line contoured back design to enhance user's comfort and stability when sitting. 5.5cm thick sponge seat pan for efficient distributing of user's weight. Curved surface, PU leather material, Stain and water resistance Adjustable armrest (sliding/height/angle) and adjustable backrest (height) Pneumatic seat height control Adjustable headrest (height/angle) Synchronous tilting system with locking function for adjustable tilting angle. Single structure castor efficient for rolling and moving Size: W480*D500*H1175-H1260 MM Material: PU Leather, Max weight- 150 Kgs. NOTE: TO ADJUST THE HEIGHT YOUR CHAIR, PLEASE PRESS THE LEVER IN THE DOWNWARD DIRECTION. ALSO,THE CHAIR HAS TWO POINT LOCK AT 90 AND 130 DEGREES.