The THRESHOLD is an extremely lightweight sunglass that includes megol nose pads and an adjustable temple. The patented interchangeable lens system creates a sleek and subtle design allowing easily interchangeable lenses perfect for the running trail, golf course, or weekend ride. Smith utilizes distortion-free, 9 base Carbonic lenses to provide precise optical clarity and maximize coverage while minimizing peripheral exposure to sun, wind, and glare. Perfect for sport or casual use. As always the Threshold is backed by Smith's lifetime warranty.