The Cosmic is obviously a well made jacket and I appreciate the details. I am a bit slender 145 lbs and 5'11". First I went with a medium. This was very baggy in the body and the arms went a couple inches past the tips of my fingers. I returned it for a small. Really easy, fast, and guilt free return process. The small works. I was worried the small would be too short, but it still has enough length in the arms and body. My wife wanted a color that she and our kids could spot me well on the hill and this is like survival suit red, with a cosmic glow.