Ergonomic Office Chair, Large Tall Office Chair High Back, Adjustable Headrest with 2D Armrest, chase back function with 7 gears adjustment, tilt function max 128°,300lbs

High back breathable mesh chair, wide headrest, mesh imported from Germany, elastic and breathable. Ergonomic principle,BACK HEIGHT ADJUSTMENT This ergonomic chair control chairback height. double back provide better support, it can be adjusted in 7 gears.Lifting chairback with two hands directly when sitting. Lift each gear quickly to find a suitable height meeting your waist and back. Lifting to maximum height then go to lowest height in a sudden. It makes lumbar support to meet lumbar curve properly, it works more comfortably. Tilt tension function: 4 gears locked, and the maximum tilt angle is 128 °. The 2D armrest can be adjusted up and down to a height of 3.93inch. It has passed the BIFMA test and has the certificate issued by BV. Max loaded :300lbs.