Ergonomic Mesh Office Chair, High-Back Swivel Computer Task Chairs - Lumbar and Head Support &ndash; Desk Chairs for Office Room Decor Adjustable curved headrest - Adjustable headrest with rotary lifting function, curved shape makes the head more comfortable, and the bolster can be adjusted up and down, which can relieve the pressure of the cervical vertebra in comfort. S-shaped human body curve structure - Designed according to the curved shape of the human spine, the waist is close to the back of the chair, and the waist is securely supported. It is not tired for a long time. It is designed with high-quality and skin-friendly fabric mesh backrest, which provides excellent back support and prevents body heat and moisture accumulation even in the body. You can relax your back and stay cool during long hot days in the hot summer! Lifting handrail - The flexible surface of the handrail fits snugly to the arm, making it easy to find your own height. Breathable elastic cushion - Ergonomic surface design, breathable, high density and flexible, effectively reducing the pressure inside the thigh. Tilt mechanism - You can pull the lever outwards to unlock and recline freely from 90 to 110; push the lever inwards to lock in the 90 upright position;this office desk chair supports up to 275 Lbs.