They work, and are easy to use. I've learned since ordering a pair, however, that I actually prefer to slightly enlarge a hat's opening with the Hat Stretcher rather than use these strips to slightly decrease the hat size. And, quite honestly, it's not exactly rocket science to adhere some strips of fabric, sponge or foam that you already have at home to slightly cinch up your hat's opening... but hey, they're easy to use and ready-to-go.