Julbo includes four interchangeable lenses with the aggressively styled Instinct Sunglasses to take on any lighting conditions from dawn in the valley to the worlds highest peaks. With the 95 light reduction of the Spectron X6 lenses, the Instinct Sunglasses provide the protection that mountaineers and alpinists need. Switch to the Spectron X5 lenses for everyday use in bright conditions. Going on a hike or ride in a shady forest? Use the Hi Contrast lenses to brighten your surroundings. Or grab the clear lenses for times when you need ballistic protection but no light reduction.