Smith Guide's Choice Sunglasses Eyes on the Prize The lenses on these glasses filter specific wavelengths of light that cause color confusion, so contrast and natural color both sharpen - not just one at the expense of the other. The Polarchromic layer adds UV-sensitive, self-adjusting tint on top of full polarization, so the lens responds as light changes rather than forcing you to swap glass mid-ride or mid-session. The 8-base curvature keeps peripheral coverage honest, and the wide temples block side light without creating tunnel vision. For anyone spending long hours outside where conditions shift, the combination of polarization and photochromic response in a single glass lens is a meaningful upgrade over carrying two pairs. Features Chroma Pop Glass Polarchromic lenses filter wavelengths that cause color confusion, combining polarization with UV-sensitive, self-adjusting tint so you get glare-free, correctly-tinted vision as light conditions change - no lens swap needed8-base lens curvature delivers a full wraparound fit with broad peripheral coverage and consistent light blockage from the sides Evolve bio-based frame material incorporates over 50% bio-based content, keeping the frame lightweight and durable without sacrificing structure Megol nose and temple pads grip skin without pinching and increase hold when wet, so the frame stays put through heat and sweat Italian spring hinges self-adjust across a range of head shapes for a snug fit without pressure points Integrated detachable sunglass leash keeps the glasses secured to you when you pull them off, so there's no setting them down and walking away | Smith | Guide's Choice Sunglasses Men's In Matte Ash Marble/chromapop Glass Polarized Opal Mirror