ES Robbins 141052 Natural Origins Chair Mat for Carpet, 46" x 60", Clear Protects low pile carpet such as loop/berber style carpet up to 3/8" thick including padding. Ideal for moderate use in home and office applications. Exclusive AnchorBar cleats hold firmly in place yet are gentle on carpet and fingers. First clear chair mat made from renewable plant sources. Phthalate-free and cadmium-free.