Some of you might be familiar with these, I wasn't until a friend of mine who has two Doberman showed them to me - Primo Pads. They are so cool that I just ordered one.
They are very firm but cushioning, clean up easily (wipe off) and are supposedly pretty durable, and with the tie-down that's now included there is no way a dog can pull up a corner and start chewing...
I grew tired of having comforters, towel and sheets in Tessa's car crate, that stuff gets too nasty and wet, and the crate bottom is to slippery to put her in without anything, so the Primo Pad seems perfect. Just thought I pass it along: