LANGRIA Mid-back Mesh Task Chair Swivel Computer Office Chair,Ergonomic Design, Max 285 lbs, Green FLEXIBLE STRUCTURE: The pneumatic gas lift system allows for easy adjustment of seat height by flipping the lever up or down; armrests can be adjusted to 3 dimensions (up and down/forth and back/left and right); 360-degree swivel KNEE TILT MECHANISM: the backrest can be reclined to 2 different angles (90,110), push the lever in to lock the chair in an upright position (90), pull the lever out to unlock the chair BREATHABLE COMFORT: the premium PP backrest with Korean mesh fabric is flexible, giving you a cool and comfortable sitting experience by promoting good air flow and eliminating sweating and moisture; the contoured mesh seat is soft and comfortable EXCELLENT ERGONOMIC DESIGN: the curved contours are designed to give optimal lumbar support and to support your body while keeping your spine properly aligned. Adjustable tilt tension accommodates all different size users HIGH QUALITY GUARANTEED: LANGRIAs mesh task chair meets BIFMA standards and supports up to 285lbs. of evenly distributed weight, its explosion-proof base plate with sturdy legs increases safety and stability Maximum Overall Dimension: W x D x H24.61  25.00 (36.22-39.96) in. Chair Height: 36.2-39.9 in. Seat Dimension: W x D x H18.90 x 18.11 x (17.52-21.46) in. Back Dimension: W: 18.11 x H: 20.47in. Net Weight: 23.59 lbs