otis boatman wrote a review of Costa Tag Polarized Sunglasses - Costa 580 Glass Lens on July 31, 2011
you don't know what you're missing until you look through costa del mar 580's. spend the extra money and get the 580 lens. you will not be disappointed. this is my 4th pair of costa del mar sunglasses and are without a doubt my favorite. the silver mirror is somewhere in between the green mirror and the blue mirror. it's not quite as dark as the blue but darker than the green. the tag fits well and wraps around close to your face. i love them. 5 stars.