I am 5'6" , 135 lbs and purchased size 8 long. It is a snug but great fit. I swim in cold water, 48-55 degrees F. and this wet suit keeps me warm with no leaking at the zipper or neck. It is flexible, allowing for easy movement in all directions. I gave it 4 stars for two reasons. First, thick fabric disks are glued inside the suit where the seams intersect. My first time out I was badly chafed on the back of each shoulder- took a couple weeks to heal. My solution- wear a shirt with sleeves. Second, the back flap covering the zipper, designed to keep water from entering the suit, folds over and is hard to reach and unfold before zipping up. I sewed a shoelace to it so I could pull it up before zipping.
Cold water swimmer