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.

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.

Conclusion. What drives the retail markup for the Air Max shoes up is the demand by consumers. Thanks to the influence of technology, comfort, design, style, and hype, many sneakerheads cop Air Max sneakers, and thus, due to demand and supply chain, the sneakers are more expensive.