About this item Ergonomic Design: The design of this office chair is in line with the principle of ergonomics, built-in solid lumbar support and curved backrest can effectively support your spine in the correct position, help you maintain a good sitting posture Multifunctional Adjustment: There are work pattern and rest pattern which you can free switch into. Adjustable armrests (up or down), sitting height (up or down), seat tilt (back and forth) and backrest (adjust and lock between 90-120 degrees) Superior Quality Materials: This chair is made of great quality materials, including durable and breathable mesh material, sturdy frame, thickened cushions, adjustable armrests, high-resilient sponge and rolling casters. Weight Capacity: 300 LBS Multi-scene and Multi-crowd Use: This chair is very suitable for offices, study rooms, meeting rooms and other occasions. This chair is the best choice for office workers, students, home workers, and people who want to adjust their sitting posture