Check the packaging All Nike shoes are packaged in a box that is properly labeled and marked. The color and print of the box varies depending on the style, but usually the boxes are orange, red and brown. The style, size, serial number and/or SKU and bar code should be printed 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.

Examine the SKU number on the box and the labels inside of the shoes. 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.