check your zippers and buckle your boots. it's time to drop in.  . the smith 4d mag xl has the widest field of vision and sharpest optics to give you the best possible read on the terrain so you can nail your line every time. thanks to the quick-swap mag lens system, lens swaps are a snap whether the day dawns clear or stormy.chromapopâ„¢ sun blackthe more you see, the more you experience. smith's superior chromapopâ„¢ technology enhances the clarity of natural colours so you see more detail without straining your eyes.vlt 12 %chromapopâ„¢ storm blue sensor mirror this lens is made to bring out the best in an area when the storm hits, and the sun hides behind thick clouds. it optimises contrast even on the worst days, so you can stay out longer.vlt 55 %