WANSHIYISHE Men's Colorful Color 3D Print O-Neck Fashion T-Shirt Polyester Fibre Asia Size Unit is runs samll,please go up 1 size than you normally wear on U.S Size, If you are not sure about your size, please refer to the size chart listed below US Small=China Medium:Length:26.77"(68cm), chest:37.80"(96cm), Shoulder:16.73"(42.5cm) US Medium=China Large:Length:27.56"(70cm), chest:39.37"(100cm), Shoulder:17.32"(44cm) US Large=China X-Large:Length:28.35"(72cm), chest:40.94"(104cm), Shoulder:17.91"(45.5cm) US X-Large=China 2X-Large:Length:29.13"(74cm), chest:42.52"(108cm), Shoulder:18.50"(47cm)