The reclining backrest will help to find the most comfortable angle that you like. Moreover, this back support desk chair is designed with 90-135 degree lockable angles to allow for a free switch between working, relaxing, and napping modes. The Ergonomic office chair is equipped with a 3-Gear adjustable backrest, the different heights people could find the most suitable use height. The high-back ergonomic chair perfectly conforms to your body curve, and is cushion-resistant to abrasion and deformation, with suitable elasticity. The high-density mesh is resistant to abrasion for long-term use. A full mesh backrest promotes airflow, and the breathable material creates a comfortable working environment for you. Meanwhile, this office chair is designed with an adjustable headrest and comfortable lumbar support, which is more ergonomic. Easy to Assemble: Detailed instructions for guidance.