WeatherTech (W20GR) All-Weather Trim to Fit Rear Rubber Mats (Grey) Deeply sculpted channels trap water, road salt, mud and sand Won't curl, crack or harden in sub-zero weather Have anti-skid ridges Made of 16 lbs. of pliable natural rubber, with anti-skid ridges to revent shifting Will not curl/crack/harden in sub-zero weather and holds up to 1 1/2 quarts of liquid without spilling