This is a great shirt. It fits closely enough that I can wear it like a base layer on cool days that will get warm, and it's light enough that I've gone for some hot summer elk scouting hikes without hating life. Also, for a lightweight material, I've found it to be surprisingly tough when bushwhacking through scratchy stuff. I'm 5'6" 140lbs, hardly any boobs, and muscular through the shoulders, and the medium is a body-skimming fit for me. The only reason I give it 4 stars instead of an all-out 5 is because it gets that weird tech-T smell after only a little bit of sweat. I'm kind of wary about wearing it for elk hunting because of that.