On the tongue in the original pairs from Nike There is the brand's logo. On the inside of the tongue on the tag should be product information, including size and country of manufacture. There is also a 9-digit serial number, which should correspond to the code on the box.

Nike product code If you want to check if a shirt is fake, Google the product code on the small inside label near the bottom of the shirt. The code you're looking for with Nike shirts is a 9 digit code made up of 6 digits, a dash and 3 digits.

A serial code normally placed on a smaller label amongst the wash tags is the first point of call. The first four characters of the 6-12 character Nike serial code designates the year and season. Our example above uses an old serial code which shows just the letter F for 'Fall'.