I've worn my Cosmic twice so far. Once on a 35 degree day and once on a 13 degree day. Kept me comfortable both days. Seemed to breath well when I did some inbounds hiking/was working up a sweat. Never overheated. Keeps the snow and wind out. I wear a medium across the board and the medium fits me perfectly. Room for layers without looking too baggy, and enough room to move athletically without catching or hindering my motion. The hood fits over my helmet and lets me turn my head pretty easily. The fabric feels great, the build feels high quality, and I'm stoked to keep using it for the rest of the season and beyond. This is the first Trew product I've owned and it definitely lives up to the hype. Also the Trew staff are super friendly and we're quick to answer questions about fit/sizing and checked in with me after I received my jacket. Not sure when the next time I'll need to buy a jacket will be, but I can't recommend Trew enough.