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.

Locate the tag inside your shoe. All authentic Nike shoes have a tag sewn into them with their size, barcode and model number on it. You will recognize it most easily by the barcode. Look for it inside: The tongue.

All Nike shoes are packed inside a box with a certain label and tag. The colour and print of the box usually vary depending on the style but mainly the boxes revolve around the colors red, orange, and brown. The print on the box should have the size, serial number, and style, with a barcode.

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.