You bike across Moab's beautiful landscape all day long with the lightest pack possible and the utmost speed, and you need a pair of sunglasses that help you see the challenges that lay on that dirty trail, but you also don't have the space for different sunglasses throughout the day. Smith solved your dilemma with its Pivlock Overdrive Sunglasses with polarized lenses. Its Pivlock interchangeable lens system lets you change your lenses out with the quickness only a speed demon like yourself could appreciate. The polarized gray lens is certainly your go to lens throughout the day due to its protection against the sunny sky and all its nasty glares. And the Ignitor lens maximizes the rocky terrain's definition and enhances your depth perception during dusk and dawn, and it has a hydroleophobic coating to protect it from liquid, sweat, and your oily skin. When your biking session rides on into the night, wear the clear lens to protect your eyes bugs and dust. The TR90 frame is resilient, flexible, and tough enough to handle your rough n' tough lifestyle. And hydrophilic Megol pads at the nose and temples prevent the Pivlock Overdrive from sliding off your face when you pick up a sweat in the middle of the day. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer andor birth defects or other reproductive harm.