Julbo drus spectron 4 desert sunglasses these sunglasses are perfect for ice climbing and glacier walks as they filter 96 of visible light with julbo special arc altitude lenses and they feature leather side protectors vented nose bridge and moulded temples lens type spectron x4 recommended lenses for deserts and mountaineering excellent quality optics scratch resistance extra infrared protection alti spectron polycarbonate lenses are recommended for all sports because of their sh