Reviewed by Cascadebiker from Portland, OR on Sunday, December 16, 2012
This is my favorite cool/cold weather top for running. Between 35-45 degrees, all I need under this is a thin wool t-shirt. It breathes exceptionally well, is soft (not clammy against the skin) and is also very water-resistant. In fact, its the best combo of water-resistant/breathable fabric I've ever seen. Its also fully windproof.
I just got back from a 5-mile run in a 40 degree downpour. The dread you feel looking out the window prior to a run in these conditions quickly dissipates when you step outside, enveloped in this thing.
It would also be pretty good for cycling, though it is not as form-fitting as I prefer (I'm 6'4", 185 pounds, and I've got an XL) for biking. It doesn't have thumbholes, which would be nice, nor does it have a drawstring at the bottom or pockets of any sort. The upside is that it is a very minimalist, low-weight item.
I've got two other Mammut softshells that are both a bit more form-fitting and have longer sleeves. Neither are as water-resistant as this though.