I believe that there are two options, electronic muffs and hearing aides that are intended for hunters. I have a set of Walker's Game Ears (fit behind and in the ear like some hearing aides) that work very well. Unreal how well you can hear and they shut out sudden loud noises like shooting. Walker advertises in all the hunting mags, particularly the deer hunting mags. You can check out www.walkersgameear.com.
My outfitter buddies use electronic muffs so that they can talk to their clients in the goose pits but not get their ears blasted when the guys start shooting. There are several designs, including some very compact models that don't get in the way much and fold up small. One of the big names in these muffs is PELTOR www.aosafety.com