WANSHIYISHE Men's Casual Short-Sleeved Hooded Sweater cotton blend 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:25.98"(66cm),Chest:37.80"(96cm),Shoulder width:16.54"(42cm) US Medium=China Large:Length:26.77"(68cm),Chest:39.37"(100cm),Shoulder width:16.93"(43cm) US Large=China X-Large:Length:27.56"(70cm),Chest:40.94"(104cm),Shoulder width:17.32"(44cm) US X-Large=China XX-Large:Length:28.35"(72cm),Chest:42.52"(108cm),Shoulder width:17.72"(45cm)