I've noticed that the really fine merino undergarments are really fragile. I put a big hole in the long janes that i bought. good thing they're for wearing UNDER stuff.

back to weather wear, if you're really working out, you're going to still be wet underneath; that's my biggest problem. I can stay warm as long as I'm uphilling, but then I'm fogging glasses and then getting cold when the pace changes. It's tough for sure.