Ergonomic DesignThe Bondesin office chair features an S-shaped barest with adjustable lumbar support that fits the natural curve of your spine. Its high-elastic,breathable mesh provides firm support and relieves prure,while the 1.18 inch lumbar adjustment offers a personalized fit to lower ba fatigue- for work,study,or ging. Multi-Adjustable FunctsThis desk chair swivels 360° and features a seat height adjustable from 18.5" to 22.05" to suit various users and desk heights. Pull out the lever and turn the tens knob to activate roing mode,with a recline ran of 90°–125°. Please note,the barest los only in the upright 90° posit. 90° Flip-up ArmrestsThe armrests of the puter chair are padded with soft PU leather and high-density fo,providing fortable and reliable support. Flip them up to easily tu the chair under your desk or sit cross-legd,offering flexibility for different spaces and postures. fortable Seat & Breathable MeshThe home office chair cush is filled with high-density fo,offering lasting softn and resilience while relieving prure on your thighs and hips. Its PU leather surface is skin-friendly and easy to clean,with mesh side panels for enhanced airflow. The elastic mesh barest bines durability and breathability,delivering firm support to keep you fortable throughout the day. Stable & DurableThis ergonomic office chair is built with a strong metal base and Class-3 explos-proof gas lift,this chair supports up to 300 lbs and meets BIFMA and SGS safety standards. Smooth,quiet casters glide easily on any flooring,ensuring stability and long-lasting performance. Easy Assembly & SupportOur office chair es with clear instructs,all hardware,and tools for qui setup in about 20–30 minutes. If you encounter issues like missing parts or da,please contact us and our te responds within 24 hours to resoe them..