SMALL - To Fit a 34 Inch Chest
MEDIUM - To Fit a 36 Inch Chest
LARGE - To Fit A 38 Inch Chest
XL - To Fit A 40/42 Inch Chest
XXL - To Fit A 44/46 Inch Chest
3XL - To Fit A 48/50 Inch Chest
If you have any questions please do not hesitate to contact us.