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It's hard to remember a day we weren't sporting our Smith Optics 4D MAG Goggles. So why not stock up on different lenses for different weather Plus, with all that goggle time logged, it's inevitable for scratches or breaks to come about. Fortunately for us, we can get all the 4D Mag Replacement Lenses we need. Their unique build widens our field of view. And Chromapop technology helps brighten lines on the trail, making sure we hardly ever get caught up on hard-to-see knolls or moguls.