Engineered with the head turning appeal of a frameless design and loaded with a Polarized Photochromatic Lens, the Revo Echo Goggle represents the pinnacle of high tech optical clarity for the slopes. Its frameless design goes far beyond eye catching appeal, allowing for maximum peripheral vision when you're bombing double diamonds and negotiating crowded groomers. Adapting to incoming light in as little as 40 seconds, the Polarized Photochromatic Serilium Lens rapidly adjusts to fast moving storms and blinding sunshine. In fact, its photochromatic lens is able to darken from 32% to 12% visible light transmission VLT when storm clouds depart and leave blinding sunshine to contend with. The lens tint also changes in the opposite direction, lessening its tint to accommodate quick moving fronts and nasty oncoming blizzards. Moreover, this lens features 50% polarization to cut distracting glare, also blocking harmful UV and High Energy Visible Light from damaging your eyes, especially at high altitudes where incoming solar radiation is most intense. Designed with a dual lens construction and Air Vent technology, the Echo keeps fogging and built up condensation at bay during warmer spring days and soaking wet storm cycles. The adjustable strap features anti slip silicone beads for an ultra secure fit. As if that's not enough, the kind folks at Revo use plush triple layer face foam for the softest, most comfortable fit available.