I mentioned that if I had a drop bag or crew for the JFK 50 that I would wear my New Balance "870's" for the trail section. That should be my NB "840's"! Doesn't sound like a big difference, but it's huge for those who are amateur shoe geeks like myself.
This is the New Balance 840: A "women's specific walking shoe" - then again, maybe that describes my ultrarunning style more than I care to admit : )
The NB 840: A fairly "minimalist" trail racing shoe for "extreme trail runners". Would be great for the Appalachian Trail section with it's hills, single track and rocks.