200 lbs, 5'10", 43" chest. First order was for XL size jacket, and it was so small that I could not zip it up! One star off for sizing issues. Reordered 3XL, and it fits with a little room to layer under it. In my opinion, you should order a size or TWO larger than the fit chart states. Jacket rolls up to a small size that easily fits in a jersey pocket, and keeps the wind and rain out. However, like with all such quasi-rain jackets, condensation from sweat soon gets you wet anyway. Better wet and warm though, than wet and cold. Taking it this weekend on a century bike ride as windbreaker and in case of rain. I like that it is transparent, thus I can pin my rider number on my jersey, and it can be seen through the jacket at checkpoints.