This shirt looks expensive and it feels great. It is created for the guy who like fitted clothing. The price is great too and it ships really fast. The asian size measurements are different from the U.S. sizes. If you wear U.S. small size and you are slender to medium build, I suggest you go one size up to U.S. medium size or (Large / US medium). If you wear U.S. small and you are have a bigger chest and muscular, I suggest you up two sizes from (Medium/US Small) to (XLarge/US Large). So go up one size up if you slender and two sizes up if you are muscular or have bigger chest and arms. Thank you I love this and will tell my friends about this great company.