I have never owned a pair of Costa del Mars. I was impressed, they fit great and don't slip off your nose. I went fishing with them and had a great view of the water and fish with the 400G lens. I have never regretted this purchase and the price. I studied them for several months before buying them. I haven't seen any difference between 580G and 400G, not that I can tell. I've always been an Oakley person and still support my other pursuits like road biking and golf. Each pair has its own use. I understand that many people cannot afford different sunglasses for different sports. In less you like me and have very sensitive eyes to the sun. At the same time, they are excellent for driving even on cloudy and rainy days. I'd say invest it, it's worth the money. Nothing is impossible in them. In addition, after purchasing from several retailers, the price was the best. They didn't have much of a choice, just what they thought sold well. I can't believe this isn't a great seller. Don't focus on blue or green lentils unless you're buying them for beauty reasons. If you buy them for what they are designed for, there is little difference between 580G and 400G. I would recommend them to anyone who asks for them. I can tell you more as a representative. Tested them too and proved their worth.
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