http://www.amazon.com/gp/product/B0006968YM/ref=oh_details_o00_s00_i00
I bought 2 of these and they work phenomenal. You can hear everything you normally can hear, and when a sudden increase in decibels occurs (eg. a gunshot) it mutes the sound. So you can talk to the guy next to you while shooting. This is worth every penny of the $189. The review I just gave is vague and silly, but I do not know the best way to put it. These are the best hearing protectors IMO, and I have tried a ton.
Those are the ones I wear. Don't work well with rifle/shotgun for me, but awesome for pistol, instructing or RO'g.