Smith Guide's Choice S Sunglasses Eyes on the Prize The mineral glass lenses on these glasses filter out two specific wavelengths to sharpen color contrast and natural color rendition beyond what standard polarized lenses deliver. Wide temples and an 8-base wraparound fit block peripheral light across a full range of conditions, and the nose and temple pads grip without slipping as sweat builds up, and premium spring hinges self-adjust to your face so the fit stays consistent over a long day in the saddle or on the water. Smudge and moisture-resistant coatings keep the optics clean without constant wiping. Features Chroma Pop Glass Polarized lenses filter two specific wavelengths to enhance color contrast and natural color rendition while cutting glare, and the mineral glass construction is highly scratch-resistant Chroma Pop Glass Polar Chromic option combines polarization with UV-sensitive, self-tinting photochromic technology so the lens tint adapts automatically to changing light conditions Megol nose and temple pads use a hydrophilic rubber compound that grips more firmly as it gets wet, keeping the frame aligned on your face through sweat and spray Evolve bio-based frame uses over 50% bio-based materials for a lightweight, durable construction with a reduced environmental footprint | Smith | Guide's Choice S Sunglasses Men's In Matte Tortoise/chromapop Glass Polarchromic Brown Green Mirror | Rubber