The The Web Chair - with Upholstered Unique Web Mesh Material offers the ultimate in office comfort. This ergonomic chair is built with your body in mind, providing a comfortable place to sit while you are busy at work.The Web Chair is upholstered with a unique "Web" mesh material which allows air to pass through, adding to long-term comfort by preventing body heat and moisture build-up. The "web" back distributes weight evenly, while providing the perfect level of back support by conforming to each individual's back shape. As with any fabric material, the "web" mesh will stretch and loosen over extended periods of usage. That's why the patented "Web Tension Knob" is included on every chair. It allows the user to tighten or loosen the tension of the mesh material with a few simple twists. The seat surface and the outer back areas are beautifully upholstered with genuine leather, while soft and durable molded and adjustable polyurethane armrests keep the user supported. The powerful pneumatic lifter allows instant height-adjustment to fit user's needs, and the tilt-tension adjustment lets the user easily control the tilt resistance felt when leaning back.