As an automotive detailer, I ask myself frequently why most european floor mats are identical to a sponge and why north american cars have it right with the rubber backing. Not only do the euro mats take daaaaays to dry properly when shampooed, but also why they use a sponge like material on the back?! Almost like they make it hard for us detailers! It's just something on my mind that no one has given an answer to!