The only way to guarantee you have received or are purchasing authentic Maui Jim sunglasses is by purchasing them directly from our website, one of our authorized online Maui Jim retailers, or locating a retailer in your area using our retailer locator. If purchasing from Amazon, our authorized Amazon sellers are Zappos, Sunglass Hut, and any listing that states it is fulfilled and sold by Amazon. We cannot guarantee the authenticity or honor a warranty for any sunglasses purchased from any other Amazon sellers as they do not get their product directly from us.