Optimized for active use and vivid visibility, the Smith Optics Pivlock Arena Sunglasses are an excellent choice for athletes on the go. Their central design feature in lens interchangeability: you can quickly swap smudge-resistant carbonic TLT polycarbonate lenses to adapt to changing light conditions. This feature is great for commuters, ultra-length athletes, and those who may be working out in changing weather conditions. (You get two extra sets of lenses in addition to the fitted pair when you order.) Hydrophilic nose pads and temple tips keep these glasses locked in place, even when you work up a sweat. The matte-black, gray-accented frame is made from strong Grilamid TR-90 plastic for lasting, lightweight durability. See in staggering color, no matter how hard you’re working.