So . . .

Finally wore a hole in the bottom of my Vibram 5Fingers Sprints, so I have replaced them with 5Fingers KSO's, which not only Keep Shit Out, but have 3mm soles as compared to 1.3mm for the Sprints. Something like that.

Anyway, they're fully as awesome. They give a little more stone-defense than the Sprints, which make them comfortable to run even on some of the semi-groomed gravel trails at our local college's cross-country course.

I've been having a bit less success with the Gracie...