Be very VERY careful though storing any foam pad with moisture in it, in an enclosed bag. They'll setup mold fairly quick in warm weather. I even had a couple of 5½" flat yellows that were brand new, (only used lightly on a test spot) that didn't get dried out good back in January that grew mold inside of them. (The bin got closed and I forgot about them and they ended up between/and under other pads.) I didn't realize they were like that for a couple of MONTHS! (Because they were yellow and I don't use those that much.)
fwiw, they cleaned out well (still have stains) but work just fine.