When I bought this jacket, I was looking for an extremely lightweight but watertight rain jacket for the Tarheel Ultra--eight days of possibly wet and windy weather. Right out of the package, with tags removed, the (size small) jacket impressed me by weighing in at 3.8 ounces. It also stuffed very easily into its own chest pocket, making a nice neat little package to drop into the pocket of my hydration pack. (Did I mention that it weighs practically nothing?) During Tarheel, I wore it every single day. It kept me dry during one long day of steady downpour. Other days, it made a wonderful windbreaker. I didn't have a chance to see how well it breathed when I was really sweating, but in cool temperatures with 100% humidity outside, I was bone dry underneath the jacket. Initially, I was skeptical of the little hand mitts. But after one chilly morning, I was hooked!
This is now my "always take it" jacket. It's so small and light that there's never any excuse to leave it at home!