This is a good example of you get what you paid for. Bought the other colors because it felt great. Had to size up as I assume the same is true as I was getting the entry level shirts. 5'8" 165 lbs.. large fit perfectly.
Typically I wear other brands like Castelli because those jerseys are form fitting and fairly good quality. I tried this Assos because I wanted a summer jersey that is well ventilated in the Arizona summers. Look no further. This is a fantastic jersey (medium) that fit well (152 lbs and 5 feet 11 inches), is durable, and of course the quality of the fabric and build is top notch. I really can't think of making any improvements. This jersey is the best summer jersey I have ever worn. Enjoy!