Full speed ahead. The Smith Shift XL MAG sunglasses are an oversized shield made for maximum coverage and performance on the bike and trail. Their wide-shield coverage maintains full vision at speed while ChromaPop brings every detail of the road and trail to life with enhanced contrast and natural color. Smith MAG interchangeable lenses use a magnetic clip for quick, fingerprint-free lens changes. Combined with a lightweight frame and non-slip nose pads, they stay put through long, hot climbs, fast descents, and extended trail time. ChromaPop lenses enhance contrast and natural color to make the details pop Light-sensitive, photochromic lenses adapt to changing light conditions Smith MAG lets you change lenses quickly Smudge and moisture-resistant coatings for easy cleaning and clear optics Large to XL fit, XL coverage 5-base cylindrical shield lens curvature Slight wraparound fit Megol temples and nose pads provide non-slip grip so glasses stay put Two-position, adjustable Megol nose pads High impact resistant TR90 nylon frame AutoLock hinges hold frames open for easy one-hand on and off