I threw this on one night after the gym. I was hot in the locker room, but stepped outside into the slightly chilled night air. I was perfectly comfortable. I can believe how quickly I cooled down (before I got to my car). I wore this today in 70 degree CA weather. It's awesome. My office is cold, and I stayed warm. I went outdoors, and I wasn't overly warm--just comfortable. I love the thumb holes in the sleeves. Perfect Spring hoody. The material and construction is awesome. I guess that's why we pay the big bucks for Arc'teryx.