Peppy Fine Air Mat - L Size A comfortable mat for senior dogs who are sleeping more. It has good drainage and can be washed off with a shower if it gets dirty. It's quite large, so you can fold it in half to add thickness and cushioning. The two sheets have been washed, but there may be some stains that couldn't be removed. Please refrain from purchasing if you are concerned about this. The back of the sheets has a non-slip feature, but some fibers from the black mat that was placed underneath have stuck to one corner. However, the non-slip effect is still present, so it shouldn't be a problem for those who don't mind. It will be folded for shipping. Thank you for your understanding.