The name is somewhat misleading, as moss isn't really the feature note at all. It's a very pleasant spicy herbal scent with a prominent beeswax note that's ideal for cooler weather. One of my favorite from the original lineup of Private Blends.
@Kaern: brèches is an uncommon French word that refers to a specific kind of honeycomb. It's the prominent beeswax note in Moss Breches that accounts for the name. (At least I assume so.)