I picked up this body armor to wear under my uniform on those occasions that it called for, but this carrier does not conceal well under a polo. It is brand new, never worn for its intended purpose (it has been worn maybe a total of 10 minutes to see how well it concealed under the polo). Class IIIA body armor (up to .44MAG) manufacture date of 01/2017, Size Medium. $250 + shipping.