They seem to keep my hat from sweat stains. They do leave a sticky residue, however, so once you've put one down, you're probably stuck using them. They work well but are expensive, not sure I would buy them again. They also smell quite bad, unlike some of my other caps. They also smell quite bad unlike some of my other caps which don't smell but if you throw them on the dash and let the sun dry the smell will go away. .
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