I have the large 17 x 24 in wool mat. When I use it - it's on my ironing board, when i am not using it I hang it from one of those plastic hangers with clips and hang it on the edge of my desk or on the door (I have one of those over the door towel racks and it holds onto a lot of my quilting things on hangers (except towels). It doesn't seem to bother the mat - no loose or indented area and is able to air dry with no problem. But I live in So. Cal. which is very dry most of the year.