Do the X20 earplugs block gunshots as well as steady noise?

They are designed for both continuous noise and impulse noise, so they suit shooting as well as engines and machinery. The seal matters most; a loose fit weakens protection.

How do I choose the right tip?

Start with the size closest to your ear canal and try each style in a quiet room. If sound leaks or the plug feels loose, move to a larger or different tip.

Yes. They are reusable plugs, so clean them after use and store them in a case to keep the tips intact.

Are they good for sleeping and flying?

They can be, since they reduce steady noise like engines and snoring. Some side sleepers find deep-insertion plugs uncomfortable, so test the smaller tips.

How do they compare with foam earplugs?

Foam plugs are cheaper and disposable but need rolling and give a less consistent seal. The X20's multiple tips aim for a repeatable fit and longer life.