First off, I was skeptical as hell on these and went a little crazy when testing them.
I broke them in on a 16 mile run through mud, clay, streams and partial lake and these held up to all of it just fine. Nothing got into the shoe through the neoshell and I mean nothing. The crazy thing is that might feet where able to breath just as well as with a normal running shoe. The ability the Altra gives you to have your toes spread out is amazing and gives you a little more security when going up those muddy hills. Oh yeah muddy hills, the grip on this shoes is awesome kept me moving with very minimal slipping. If you are looking for a great weather resistant shoe this is the one. The only suggestion I would have is if you plan on going over your ankle depth then get the gaiters, I just ordered them.The link for the shoe is here.