The trail ready Attack MAG MTB features Smith's MAG lens interchange system that enables you to quickly swap between the included bright-light and low-light ChromaPop lenses; improving visibility on the trail regardless of light conditions. For fog-free vision, the Attack MAG MTB features a ventilation channel in the brow of the larger, maximum coverage lens. Hydroleophobic lens coating repels moisture, grease, and grime to give you a clean field of vision while you charge down and uphill. These details, combined with the secure fit of a two-position, hydrophilic nose pad and megol temples, make it the most complete trail riding eyewear piece in our collection. A Photochromic lens option gives you the transition from clear to gray so you can keep going while you dart in and out of the overhanging trees. After you park your Mountain bike to kick back on the tailgate for a drink after a hard fun day of riding you can keep your Attack MTB protected in the custom hard case that comes with each pair. With many frame colors and lens options to choose from Smiths Attack MAG MTB will quickly become one of your favorite glasses to ride in. No matter what your style from eye catching red mirrored lenses to understated speed in all black we have something for everyone.