Despite having some hearing loss, my hearing is incredibly acute and I've done shift work for the vast majority of 30 years, with the last 6 being strictly on the vampire shift.
According to various audiologists and ENTs my ear canals are quite abnormally shaped and tiny. I used one brand of really soft plugs for decades until they stopped being produced in 2020, and then I spent a lot of time and money before finding these.
I've given some to at least a dozen friends for themselves and their kids when they've mentioned not being able to find small earplugs, and they've all purchased a bunch
My only gripe is that they no longer offer the bags of 100 plugs, which would make it easier to build a stockpile