Mesh back & headrest, PU foam seatâ?º Backrest 4-pisition tilt-lock adjustment with synchronized seat and seatback deviation 1:3â?º Backrest tilt tension adjustmentâ?º Backrest height adjustmentâ?º Headrest height & angle adjustmentâ?º Pneumatic seat height (90mm) and depth (50mm) adjustment â?? sipro mechanismâ?º Seat 360° swivelâ?º Armrest height & depth adjustmentâ?º 5-star nylon base â?º ANSI/BIFMA X5.1 approved â?º 50,000 Martindale â?º Recommended maximum load 150 kg with 2 years warranty