Fits like American sizes. I ordered one size up thinking it would run small but it was true to size.This is more of a shirt sweatshirt. Not made of cotton (like champion sweatshirt material) but a silky, thin shirt/sweatshirt. My son likes this material so it works but keep in mind It’s different.Shipping was fast too. I would recommend this seller and product. His size is 130 lbs 5’ 11” and it will be a little baggy