I want to wash the cap I wear frequently when it gets dirty or sweaty, but washing it by hand is troublesome, and I'm worried about it losing its shape in the washing machine... The solution to such problems is the "machine washable cap washer". Just insert the cap inside and it can be washed in the washing machine while preventing it from losing its shape. Even after washing, just hang it on a hook to dry and use it when storing. It also comes in a kids' size, so it can be used as a child's cap or a baseball cap that gets dirty. This product will keep your favorite caps clean for a long time.