I finally got the opportunity to try out my Patagonia R1. It is an awesome piece. I cannot believe how warm it is compared to how light and thin it is. I can certainly see how it is a fast drying piece of clothing. One thing that I was wrong about was where it would fit in with my layering system. I had a preconceived notion that my layering system would be an aerowool base, the peleton 200, followed by the R1, and finally the Kuiu guide jacket. However, the R1 is more form fitting than I thought, and fits better under the peleton 200. Not a big deal but something you figure out when you have the various pieces in hand and can actually try them on.