Lorell Rectangular Roll-Up Chairmat, 42 by 48-Inch, Natural Bamboo is harvested from sustainable forests Material is kiln-dried to the optimum moisture content to minimize cracking and warping Premium, nonslip felt backing keeps mat in place and protects your floors Bamboo is harvested in an eco-friendly manner from sustainable forests Material is kiln-dried to the optimum moisture content to minimize cracking and warping Premium, nonslip felt backing keeps mat in place and protects your floors