+1 for the Howard Leight Impact Sport.
At -24dB they don't offer as much attenuation as some others, but the electronics are really good. Sound localization is as good as it gets for a muff - truly.
Battery life is suprisingly good, and the 1/8" audio jack is just a bonus - I pipe in some tunes from time to time, it's pleasant.
All of this combined with the low form factor and portability makes a great product.
I'm a total audio nerd, and have been through several in-ears, custom plugs, and more muffs than I can count (no soundtear yet though!)
In a past life I worked as a professional audio engineer, and learned to take my ears very seriously. Impact Sports travel pretty much everywhere with me, love 'em.