I tear the cotton rounds into thirds (approx) and then kinda roll them like you would a foam plug and insert to desired depth. Just my opinion but I found they pretty evenly and naturally attenuated everything to a level that made it comfortable. Never had a problem with boom. I've had people tell me they don't work at all but I mean, it's a physical object blocking your ear canal. Science says it works. For a few bucks it's worth a try. If it ain't any good then you can give them to your girl to remove her cosmetics with at night, lol.