We go to a lot of concerts and listen to metal so needless to say they are LOUD. I always forget to bring earplugs and they are very overpriced at the concert. I love that these come on a keychain and there are 4 so we each get a pair.
They fit snug in the ear and block the loudness without blocking the sound (I'm assuming by some magic wizardry of some sort) I like that they aren't the foam ones. Those alwasy seem very unhygenic to me. these are easy to clean and they are clear so you can see WHEN they need to be cleaned. The keychain is also great for carrying medicine and whatnot when you aren't taking your earplugs.