Our Vallon Goggle, named after the famous Mont Vallon in The Three Valleys. Comes with our fully polarised Category 3 Red Lens for bluebird days in the mountains. All of our polarized lenses are made from triacetate cellulose - or TAC for short. There are 7 layers that makeup TAC lenses. The first is a polarizing layer that provides 100% polarization that absorbs glare. The second and third layer allows durability that resists harsh environments. The fourth and fifth are UV absorbing layers that absorb over 99% of ultraviolet rays. The last two layers are shock-proof layers that increase impact and scratch resistance.