The Zeal Optics Manitou sunglasses are crucial sport sunglasses when you'll be traveling through varying light conditions. Utilizing specialized Auto Sun lenses, light-sensitive, photochromatic lenses, that change become darker or lighter depending on available light so that you have the right amount of coverage when you're passing under tree coverage or as cloud conditions change. Wide rectangular sunglasses offers full coverage. Bio-Resin, plant-based frame material. Zeal Auto Sun photochromatic lens adjusts automatically to changing light conditions. Proflex rubber is injected into each frame to provide a secure hold and withstand extreme hot and cold temperatures. Polarized lens treatment reduces glare for added eye protection. Single-bridge design. Curved arms with rubber back grip that provides traction when wet. 100% UV protection. 6 degree base curve. RX-ready design. Case included. Made in Japan. Measurements: Eye Size: 61 mm Bridge: 18 mm Temple Size: 143 mm Weight: 1 oz WARNING