The backing is made of some type of foam that doesnt hold water. The carpeting is your standard Marine grade carpeting found on boat decks. I'll have a tonnou (sp?) on it eventually but it dries within 15mins of being in the sun. I washed the truck and soaked the liner. It wont see Extreme abuse in my truck as the only thing i usually haul in the bed is firewood, dirtbikes, and lumber. For extreme stuff you can pop out the liner in a minute but then your bed wouldnt be protected. I bought it mostly to keep the bed from getting scratched up by the bikes, for lounging in at the Drive-In and to help protect my truck tent when i go camping. Guess i'll findout how it does as time rolls on. It'll be getting the muddy bike treatment next weekend.