Knock-off sunglasses are big business in the Michael Kors Factory Outlet counterfeit market. According to the U.S. Customs and Border Protection, fake sunglasses are frequently seized. However, many fakes make it pass the CBP. Typically these fakes are replica versions of top designer brands. The Costa Del Mar brand is often counterfeited. Costas are made with patented technology that provides 100 percent polarization and 100 percent UV protection. The lenses are scratch-proof, with a premium glare-absorbing anti-reflective coating. The knock-offs do not contain this technology. It is important to know that you are getting authentic sunglasses not only for style but also for safety.Does this Spark an idea?Other People Are ReadingHow to Spot Fake Costa Del Mar GlassesHow to Clean Costa Del Mar SunglassesInstructions 1Browse the online store at the Costa Del Mar website. Check out the various types and styles of the brand. Closely examine the logo and overall quality of the sunglasses with the zoom feature.2Look for a Costa Del Mar sunglasses case that includes a high-quality cleaning cloth. An authentic pair of Costas comes with a high quality, durable case and thick cloth.3Study the wave logo on the sunglasses. A fake pair displays a logo that is not sharp or is even slightly larger or smaller than the authentic logo. The genuine Costas logo is a very crisp "C" in the shape of a wave.4Put on the sunglasses to see the "580" hologram in the lenses. Costa Del Mar representatives say that being able to see the "580" in the lenses is the easiest way to determine if the sunglasses are real or fake. Counterfeiters are unable to duplicate this hologram in the knock-offs Michael Kors Outlet Store.5Closely study the tags and any literature with the sunglasses. Most counterfeiters make mistakes with grammar or include misspelled items on the tags or literature. A photocopied type of brochure is a sure-fire sign of a knock-off.6Check for the warranty. Costa Del Mar sunglasses include a manufacturer's lifetime warranty that covers defects in materials and workmanship for the lifetime of the sunglasses. Fakes will not have this warranty.Tips & WarningsTrust your gut feelings. If you feel that a pair of Costas are just not quite right or something just seems off then they are probably fake.Always be especially careful when buying Costa Del Mar sunglasses online. Check the official website to make sure you are buying from an authorized dealer.