All rubber mats are not created equal! Polyurethane-bound rubber crumb mats are porous and will absorb water and degrade over time. 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.