I am a 5'6" , 110 lb. woman who wears these shirts for comfort and warmth. I bought the shirts originally for exercising in the cold, but now I wear them all the time! I purchased a Small and it fit perfectly. Roomy, but not boxy, and it will still accentuate my natural curves. These shirts also wash very well and can be dressed up or down. I'd absolutely recommend this shirt to anyone!