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.

The model number (or SKU) of a shoe can be found on a label located on the inside of the shoe tongue. RN stands for registered identification number. It is a number assigned by the FTC to US businesses that manufacture, import, distribute or sell products covered by the textile, wool and fur Acts.

Every pair of authentic Nike shoes comes with an SKU number that is identical to the SKU number on their box. If the numbers are missing or do not match, they are likely fakes. Check the tongue label. Often, fake Nike manufacturers put outdated sizing labels on the inside of the shoe.