My husband has tons of hats and they need to be cleaned. This does the trick. It works best on relaxed caps, ones that are not formed. It can be difficult to close and keep closed. It doesn't fit as snug as I would have liked to enable it to help keep the cap's form. It does, however, keep the hat in the basic shape without it being crushed in the laundry. It also works well to help form the hat as it dries. I would still purchase it again, but I think due to it being a universal size, it doesn't fit as snug as I would have liked it to. Much better than scrubbing the hats by hand.