ES Robbins Natural Origin Rectangle Vinyl Chair Mat for Low Pile Carpet, 46 by 60-Inch, Clear First clear chair mat made from renewable plant sources that contains 26-Percent USDA Certified Bio based content by weight Phthalate FREE and Cadmium FREE Protects loop/Berber style carpet up to 3/8" thick including padding Limited Lifetime "No Crack Mat" Warranty Made in the USA