What is better than being assure that what you are buying a sunglasses is 100% authentic, real, and it is coming from a legitimate business located within the United States. As you may know, there are many fraudulent websites trying to sell fake or refurbished sunglasses to the consumers. There are few websites guarantee the authenticity and only sell 100% brand new products. What you buy from these sites identical to what you can buy from your local authorized retailer.
In another word, if you buy a pair of sunglasses with the same model from your local authorized retailer, the only difference will be the price. After receiving your pair of glasses from these reliable sites, you may take it to any store and have them to inspect the pair for authenticity. If they do not confirm that the item is 100% authentic, send the item back for a full refund. They are so sure about the authenticity of our products that they even give you $50 extra, if your local authorized retailer advise you that the pair is fake. They do need the store name, phone number, and the name of the person. They have been selling online since the year 2004 and they have served more than 20000 customers since then.
No one has ever been able to get the $50 offer back as these sunglasses are 100% real, original, and authentic. Glasses purchased from them always come with their original case, cleaning cloth, manufacture note, and certificate of authenticity(may or may not be available depending on the brand.)
So I recommend to buy sunglasses from those sites who are giving you 100% guarantee on refund if found fake or refurbished.