I've used foam plugs for over 30yrs while riding. I can't ride down the street without them. They work fine as long as they are properly inserted---that's the problem--most people I see wearing them don't have them in right, this includes "professional" racers!!
If you follow the instructions on the package, you'll have no trouble, IMHO. Disposal plugs have come a long way, the older hard foam E.A.R. brand were tough on the ear canal after awhile and the NRR (noise reduction rating) was low. I've tried (and have) just about every brand available--my favorite now is Howard Leight brand Laser Lite #LL-1G, they have a NRR (the highest out there) and are very comfortable for hours of use. BTW- most brands come in different sizes for smaller ears.
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should be able to supply more info.
I keep saying I'll try custom plugs someday, but the cost, and trouble along with the fear of losing them, makes me stay with the disposables
Unfortuneatly, the problem with hearing loss is, once it's done there's no going back!!
Good luck,
And let me know if you'd like a starter sample kit of plugs.