Polyethylene foam mats are susceptible to shrinking when exposed to UV and exterior elements. Standard installation of many foam mats requires drilling into the truck bed to permanently install snaps. Black Armour® mats are created from 100% high-density, vulcanized recycled rubber. This unique vulcanization manufacturing process means there are no pores for water to seep into or degrade the longevity of the mat. Black Armour® mats are heavy-duty, ½” thick rubber and have a 30-Day Money Back Guarantee and a Limited Lifetime Warranty.