Waterproof seat covers?

I can thank my son for this latest mod I'm interested in Mina. We were in the car driving last night and he had an accident . It would have been great if he spilled soda or some sort of beverage but noo he wasn't able to hold "it" any longer and the poor guy peed. So here we go to get the rear seat shampooed(sp). Does anyone have any experience with Neosupreme material used by Coverking? The cost is way cheaper than the "real" stuff, Neoprene. I'm just thinking with two little guys this is bound to happen again, Ryan