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 naturalcolor. 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.