Julbo Vermont Classic Glacier Sunglasses The Spectron 4 lens is a classic mountaineering lens, blocking 95% of the visible light. Lite-weight but with excellent shock resistance, this versatile lens is suitable for all types of sports activities Flash treatment improves visible light filtering with a mirror effect on the lenses. Lens has an anti-reflective (AR) coating to provide relief from glare off the back of the lens. Like all Julbo lenses, these lenses are optical category 1. 100 % A,B,C UV Protection. Lens depth-51. Distance-23. Temple length-172 Traditional rubber covered wire temple arms Leather side shields and nose piece