The Floortex Cleartex XXL Polycarbonate Chair Mat provides the ultimate in quality, clarity, and durability. This chair mat won't crack, curl, dimple, yellow, or have a chemical smell. It provides ergonomic benefits by providing easy glide movement, which reduced leg fatigue. A textured finish to provides friction and helps keep the chair in place. A gripper back ensures a stability for all pile carpets. Polycarbonate mats can be used immediately, unlike PVC there is no need to wait for the product to lie flat. Environmentally safe, PVC-free, and free of toxic chemicals. This item has a limited lifetime manufacturer warranty.