Please measure one of your Favorite Polo Shirt at home from Armpit to Armpit before purchasing.

US Small (European L) Armpit to Armpit 20" Inches / 51 cms

US Medium (European XL) Armpit to Armpit 20.8" Inches / 53 cms

US Large (European 2XL) Armpit to Armpit 21.6" Inches / 55 cms

US X-Large (European 3XL) Armpit to Armpit 22.4" Inches / 57 cms

US 2X-Large (European 4XL) Armpit to Armpit 23.2" Inches / 59 cms