However, with such a vast selection of products comes the risk of counterfeit items being sold on the platform. One area where this is particularly prevalent is in the sale of shoes. Despite Amazon's efforts to crack down on fake goods, a significant number still make it onto the site.

Nike Free always helps enhance your body's natural motion, but the barefoot-like-running experiences vary from shoe to shoe. These variances are graded on the Free Scale. The lower the number, the more barefoot-like the shoe.

If you want to sell a Nike shoe, you must get Amazon's approval. Once approved, the restrictions will be lifted, and you can sell as many Nike shoes as you want. Remember that Nike isn't Amazon's only restricted – or gated – brand. You can find the complete list of gated shoe brands with a simple search.