Floortex Ultimat Polycarbonate provides the ultimate in quality, clarity and durability. Provides ergonomic benefits for chair users by providing easy glide movement and reduced leg fatigue. No cracking, no curling, no dimpling, no yellowing, no smelling. Free of toxic chemicals and PVC. Polycarbonate mats can be used immediately, unlike PVC there is no need to wait for the product to lie flat. Sits under any large, medium or small computer desk.