Check the sizing chart. Order accordingly. No need to size up or size down, unlike Capo's Euro slim jerseys which generally require a size up. Note the black isn't really solid black, more like a charcoal heather and there's no little Italian flag under the lettering if that's important. The material is pretty thin and a bit stretchy, but I still would not size down unless you want to look like a human sausage off the bike. The thinness of the material is a little worrying, it looks like it might snag or wear pretty quickly unlike their jerseys which are always top quality.