Lorell 55 by 57-Inch Roll-Up Chairmat, 9-1/2 by 23-1/2-Inch Lip, 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