Stay cool and comfortable as you work with this Air Grid task chair! Flow-through seat and back for better air circulation Attractive ventilated mesh seat and backrest let air circulate more freely than chairs with solid backing. Lumbar cushioning supports your lower back and enhances the natural curve of your spine. This chair's curved backrest design bolsters the lower back, preventing spinal flattening that can lead to fatigue and back pain. Padded arms relieve shoulder strain. Armrests with comfortable polyurethane padding provide excellent support for forearms and elbows. Easily move the armrests higher or lower to help prevent neck and shoulder strain caused by poor posture and slumping. 1-touch seat-height adjustment for proper posture. With the help of a pneumatic lift, you can instantly raise or lower your seat cushion to the height that's perfect for you. Experts advise that you sit with your thighs level with floor and your feet resting flat for optimum comfort and blood flow. Tilt controls for ideal positioning. The built-in synchro tilt control allows your chair's backrest to recline at twice the rate of the seat, so you can lean back and still keep your seat cushion relatively level with the floordistributing your weight more evenly between your torso and legs and aiding blood flow. Adjustable tilt tension lets you determine the amount of pressure required to lean back in your chair when you want to relax. A convenient lock keeps your tilt settings securely in place. Recommended for moderate use 3-6 hours per day. Dual wheel casters for easy mobility. The heavy duty nylon base offers strength and stability, while the oversized carpet casters allow for smooth rolling across virtually any floor. Meets or exceeds ANSI/BIFMA Performance Standards. Chair has met quality standards for safety and durability established by the American National Standards Institute (ANSI) and the Business and Institutional Furniture Manufacturers Association (BIFMA). Measure.