Dirty girl is the brand, they are ankle gaiters that work with most trail running and low to mid height hiking boots. They do a pretty good job of keeping dust and rain out of your shoes from the top, and them only being ankle height means they are both lighter weight, and nicer when its hot out, but offer less protection if it is really cold and rainy.

They're olive drab color, so fab to be drab is probably just some branding speak for that.