These are miniature versions of those cheap bathroom mats with the white stuff on the back that is never going to come out of your washing machine.  That being said, I will just avoid washing them haha.  I got these mats because my dog is getting older and had trouble on my wood stairs.  It took him a few days, but now he is more confident and will go up on his own.  For us they are the perfect solution to help us keep our guy (safely) active.