This office chair has a breathable mesh surface for increased airflow with good heat dissipation. The high-density sponge cushion features an 8cm thickness to make sure lasting plumpness and comfortable support. The flip-up armrests enable the chair to convert into an armless chair for saving space. This swivel office chair allows you to easily change directions. With a 90-120 degree rocking tension control, the backrest can be adjusted to the most comfortable position. 10cm height adjustment guarantees universal compatibility with tables and desks to ensure a proper seating posture. The ergonomic back with lumbar support offers better protection to your spine and also reduces fatigue during 8-hour seating. If you are looking for an office chair like this, do not hesitate to place an order!Flip-up Armrests for Space Saving: Practically equipped with flip-up armrests, this mesh office chair allows you to fold the armrest up, performing as an armless chair and saving space, which is suitable for limited rooms, home offices and more. And when the armrests are put down, it cozily accommodates your hands and arms. Ergonomic Lumbar Support and Rocking Backrest: This home office chair features lumbar support, which can make sure that your waist gets the proper support, increasingly reducing the stress accumulated through long-hour seating. The backrest has 90-120 degrees of rocking function, catering to each individual for comfortable seating. Height Adjustment and Swiveling: Thanks to the SGS-certified gas lift, this computer desk chair is able to adjust its seat height smoothly from 45-55cm. The task chair flexibly matches most of the computer tables and studying desks for a proper seating posture. Besides, the seat swivels at all degrees, so you can easily change direction. Breathable Mesh and Padded Seat: The mesh backrest has strong tensile strength and ensures breathability and heat dissipation for comfortable leaning. Padded with a high-density sponge, this adjustable swivel chair delivers a soft seating experience. And the oversized seat also provides comfort and relaxation. Silent Mobility and Reassured Quality: This mid-back office chair rests atop a durable 5-claw nylon base to ensure high-grade stability and reliability and the loading capacity is up to 150kg. The nylon casters roll smoothly and quietly even on carpeted floors. Coming with detailed instructions, the assembly is fast and simple with no worry.