If you mean earplugs, there is a certain way to insert them so that they are the most effective.
You have to roll them with your fingers so they're compressed into a cigar shape (at least on one end), then insert that deep into your ear canal, then give it a minute or so to expand.
If you stick them in uncompressed, they won't work well at all and may even fall out.
I like the E.A.R. Classics (yes made by 3M) - they have a 29 decibel reduction -
https://www.earplugstore.com/eclpvcfopln2.html
If those aren't working for you, you can get a variety pack from this store and try out many varieties to see what works best for you. I've been getting my earplugs from there for years, and they're a reliable retailer. It looks like they do ship internationally.
Good luck!