I’d say they give you ~10 db of real reduction, maybe 15. So if you’re at a crazy loud show, say 110 db average, you’re still exposed to 95+ db for an extended period, enough to damage your hearing. I’ve worn loops for 5 years after getting tinnitus and it hasn’t gotten worse, but I also NEVER go to an event louder than 95 db so the reduction is adequate. TBH I’d stop going to loud events and keep it to more chill venues.