Julbo gave their high-tech Explorer Sunglasses incredible Alti Spectron 4 Lens that provide 95 visible light reduction to protect your eyes on high-altitude mountaineering trips. Take these Julbo glacier glasses to Rainier, Alaska, or even the Himalayas. Designed with help from Chamonix mountain guides, these glacier glasses features removable side shields and a wrap-around design that rivals the protection offered by goggles in high winds and blowing snow. The Explorer Sunglasses also include a removable stretch headband to keep them in place and let you drop them to your neck when you crawl into a tent. Julbo added frame vents to reduce fogging because you cant climb if you cant see.