Yaheetech Ergonomic Mesh Office Chair, High Back Desk Chair With, White/Gray Ergonomic Mesh Desk Chair: This high back office chair's ergonomic features, including a large adjustable headrest, retractable padded armrests, a movable lumbar pillow, rocking function and 3.5-inch adjustable range of seat height, offer customized comfort for extended periods of work, study or gaming. Cushioned Seat Mesh Back: This office chair is designed to bring the combined benefits of a foam padded seat and a mesh backrest. Extra-wide cushioned seat is elastic and not easy to deform, offering optimal support for a long period of sitting. Plus, the high backrest wrapped with breathable mesh provides you with a cooler sitting experience and full back support. Adjustable Comfort: The height-adjustable headrest of this mesh gaming chair allows you to find the most comfortable position for your neck and head while sitting upright or reclining. The lumbar support can also be adjusted to maintain proper spinal alignment and promote good posture. The adjustable range of the lumbar support is 2??. Convenient Mobility: This big and tall office chair is equipped with nylon swivel casters to make sure users can move with the chair effortlessly with a 360 degrees rotation. Durable materials of these five casters allow smooth and steady mobility. Straightforward Instructions: All the hardware, connection parts and handy tools are provided in the home office chair's package. Detailed, easy-to-follow instructions facilitate quick and hassle-free assembly.