Kinda new here, so not sure this is the right place to review these. I know most people use IEMs. I just never liked them. These GK's have been a game-changer for me. Hell...a life-changer. Wish I found them years ago. Invented/sold by Gordy Knudson (Steve Miller's drummer. And if you call to place an order, he'll answer). Short version- he took the best shooters isolation cans and stuffed them with the best possible Sony speakers. Bottom line: my mix is at least 50% lower now. These things freaking isolate. So ALL you will hear is what's coming through them. I even wear them while mowing. I have a VERY loud old Craftsman rider, and when I wear these I can't even hear it. Seriously, best $250 I've ever spent. If they existed years ago I wouldn't have tinnitus . So now, if you see someone on stage with red stripes on their cans, you'll know what you're looking at!