Sophia & William Ergonomic Mesh Office Desk Chair with Lumbar Support & Adjustable Armrest-Black

Oversized heavy duty chair measures: height:35.4"-39.4", backrest height:21.3", back width:20.5", seat depth:18.9", seat width:18.9", maximum weight 300 lbs. Ergonomic Design: S-shaped backrest design of the office chair perfectly fits the curve of human back to reduce the pressure on cervical vertebra and lumbar vertebra. Adjustable: Height adjustable: 35.4” - 39.4” to meet the needs of people in different height. The height of the armrests and lumbar support can be adjusted so that you can find a most comfortable position Flexible: 360° Free swivel for easily communicating between you and your colleagues. Smooth-rolling casters for easily moving to anywhere you want to go with ease and no effort. Stable & Durable: This mesh office chair has been certified by BIFMA and SGS, the durable base safely handling weight up to 300lbs. Breathable Mesh Back: The back and cushion positions are made of breathable skin-friendly mesh. The high-density foam cushion provides maximum comfort whether you are sitting for long hours in the office or at home. Tilt Function & Lock Upright: Tilt tension knob locks any angle between 90-140 degree. There are different modes available: 90°comfortable working, 105°relaxing reading, watching movie 120°, and rest 140°.