Children -Re-enactment on the March

[M. Demetrius]

No, carbatinae are one-piece, soft soles, like moccasins, more or less. No hobnails. We do add a saddle-leather sole, since we have lots of thorns on everything from vines and trees to grass and cactus here in Texas, but it isn't historically necessary, and from what I've seen, the originals didn't usually have that outer sole.
http://www.andyburke.co.uk/ancient.htm
http://www.larp.com/legioxx/civcloth.html
On the other hand, I have thought of putting hobnails on an outer sole so I don't have to repair the stitching as often. Might just do that one of these days.