I have used THESE Surefire plugs for years now, same pair, and have liked them more than most. They block out stuff that hurts your ears but allow you to hear other stuff too. As jeremy stated it is possible to sleep with them in and otherwise forget you have them in your ears. As far as plugs go, there isn't much better that I have found.
I have also used the Peltor COMTAC for 6 ~ 8 months in the 'ghan with success. It does what is advertised, blocks out stuff that will harm your ears but allow you to hear regular conversation/talk on the radio and more. They are somewhat uncomfortable to wear for long periods of time and pricey. I will probably pick up a set for personal use one of these days when I get some extra scratch.
I have also used the Peltor COMTAC for 6 ~ 8 months in the 'ghan with success. It does what is advertised, blocks out stuff that will harm your ears but allow you to hear regular conversation/talk on the radio and more. They are somewhat uncomfortable to wear for long periods of time and pricey. I will probably pick up a set for personal use one of these days when I get some extra scratch.