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 can't climb if you can't see. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer andor birth defects or other reproductive harm.