Mid-back chair frame features a mesh back that allows air to flow freely when you're seated to help you stay cool throughout the day. Ergonomic design support the natural curvature of your lower back to help prevent strain through extended seating. Height-adjustable arms can be positioned to accommodate your personal preference. Seat-height adjustment with tilt tension allows a variety of users to sit comfortably at their desk. 360-degree swivel allows you to effortlessly rotate the chair for added convenience. Chair frame is designed for Lorell upholstered fabric and leather seat cushions (sold separately).