i am about 5'6" 140 pounds, i fit into a medium but its a little baggy but i like my stuff a little big. but this jacket is so warm and super waterproof. i have gotten many compliments on the jacket, keeps me dry and warm. it is one of the most universal jackets, the interlinear is amazing. my favorite are the "hand warmer" pockets, they are huge and you can put your hands in there and stay warm. overall jacket is well worth the price.