This jacket is awesome!!! I am 5'6'' and about 115lbs. I bought this jacket in the size small and it fits just perfectly!!!! I bought this jacket more for aprés skiing and nights in Tahoe and it works perfectly. I like my jackets to be a little looser and not as form fitting, the size small was just that! It has enough room for a small long sleeve or two for super cold nights but not too big where I'm swimming around in the jacket. Will be perfect for spring skiing as well!!! If you plan on wearing this jacket for snowboarding/skiing and like your gear to fit looser, I'd recommend maybe getting the medium so you have more room for layering and a longer fit! Overall, this jacket has become one of my favorites and I would definitely buy again!!!!