I bought an M as I am between S and M. M was a little big but that is fine, especially when layered up. It really kept me nice and warm and I've received compliments because it had a slimming shape as shown in the picture, but not too much for me on M. However, after wearing it for 10 days, upon my 2nd wash I was appalled to discover two holes slightly bigger than my thumb in the lining of my hood. The stitches were undone and one was torn quite badly. I am sending this in for warranty-check as Columbia has Lifetime Warranty for their outerwear, but I hope it will be eligible for a replacement.