I know you can get professionally fitted earplugs, and I expect that those can’t be beat, but I’ve never wanted to get that expensive.
Hearos are awesome. I first heard of them through the other guitar player in a band I was in about 4 years ago. If you play in a band, habitually visit live shows, or go to anything else that is Really A Bit Too Loud, these are what you want. More comfortable than simple foam plugs, you can still hear what you want to hear (let’s assume you’re at a loud concert, playing or listening), without blasting your eardrums out before their time.
Again… this is not an ad, I’m not being paid, I just think they’re great.
If I keep doing posts like this, I’m going to have to think of a title other than “Cool Tool,” I think we should leave that to Kevin Kelly.

I’ve had these for awhile, too. It definitely helps that they’re washable, so they’re not one-and-done. While the other guys in my band are a bit harder of hearing, I’m still pretty good. I think. :)