【BIFMA Certification】The mesh chair can bear the weight of 250lbs.It comes with ergomomic office chair backrest with a reliable lumbar support will help you keep in a right position during long time working.All the parts BIFMA certification, more reliable and sturdy.Computer chair desk chair big and tall adjustable chair 【Comfortable and Breathable】The backrest are made of high-quality breathable polyester mesh to keep you cool and comfortable. High-density foam-filled seat cushion resists deformation to provide the support that lasts all day long. 【Flip-up Arms】The adjustable armrest is the unique feature of this office chair. The height of the armrest can be adjusted according to your requirements. To provide better comfort, When idle, you can lift the armrests to push the chair under the table, which can save your space perfectly 【Easy to Install】Ergonomic office chair with all the hardware and necessary tools. With the installation instruction.Take on the office in about 10-15 minutes! And all parts of the gaming chair are given a number and detailed assembly steps are listed for your reference. 【Design Upgrade】The upgraded gas lift and spring are stronger and more durable.Ergonomic office chair backrest Protect the spine.Smooth and durable casters - the PU casters provides great mobility.And protect your floor.Made of high Quality thick sponge and breathable mesh clothes.Keep your body comfortable,office task chair swivel chair rolling chair We present this brand new Mesh office chair with a unique appearance and feel, unlike most office chairs on the market, Mid Back Office Chair， with Flip-up Armrest & Lumbar Suppor ,The upgraded gas and foot wheels are more sturdy and durable, and have a longer service life.Our Ergonomic Desk Chair feature with Ergonomic design, High-end appearance, Mid Back, Sturdy construction. 360 degree swivel wheel and chair can be more flexible in working station. Product Specifications: Material: Breathable mesh, High-density sponge, Metal base, Filp-up Arms; Color: Black; Seat height: 16.9"-20"; Max Load Weight: 250 lbs; Package included: 1 x Mid back office chair, 1 x Instructions;