From the manufacturer

Check your zippers and buckle your boots. It's time to drop in. The Smith 4D MAG™ brings our widest field of view and sharpest optics to give you the best possible read on the terrain, so you can nail your line every time. Add our quick and easy lens-change tech, and you've got the only goggle you need for all-conditions riding. Thanks to ChromaPop™, the 4D MAG™ drops you into a bigger, brighter, sharper world.

For an ideal fit, pair your Smith goggles with a Smith helmet. 

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