Rating: 5 / 5
A massive rainstorm drove me from a day hike in Rocky Mountain National Park and down to Boulder, CO, and the Montbell America store. I picked up their UL Windshirt and have been pretty thrilled with it. It shed sprinkles with its well-regarded Polkadex DWR coating, cut the wind, and as far as breathability, it was better than most windshirts I've tried, but I have no data for comparison with other manufacturers. I'll update this review with how it fares in real rain once I encounter such conditions.
The piece looks really nice, though, and is incredibly comfortable, and clocks in at the advertised 2.6 ounces (74g). The new shoulder pocket is of extremely limited utility, however, and in my opinion is unnecessary (despite its aesthetic value) unless I decide to use an energy bar to make my arms look all buff. :-) Its full zip is the best feature, providing excellent venting. The cut is trim across the abdomen but is really quite accomodating across the shoulders; the arms have generous length, the elastic wrist holes aren't too tight, and the neck hole is plenty big. Even the zippers' recurved shapes make them easier to grip...those little details are an elegant touch.
It's a solid winner as a microweight wind layer (I intend to use it over a Patagonia R1 Hoody in cold conditions) or as an adjunct piece to a poncho/tarp worn as rain gear.