I really want to love this jacket--it looks great and seems super warm for being a thinner jacket. But I agree with the other review that said it's a little snug in the shoulders. I ride in aero a lot and don't see myself being overly comfortable for a long ride. I am not particularly broad-shouldered either--5'10", 136 lbs. I wear a size 6 in clothes and ordered the Large. The reflective detail is great (I run and ride before the sun comes up and LOVE reflective gear), and although I do wish it had thumb holes, I may keep it just because it's cute. But it's definitely a little too tight to wear for running and biking.