The durable and fog-minimizing EVAK vent technology keeps vision clear while the Triple layer face foam with microfleece facing make cheekbones a little happier on the mountain. The Blok also combines a wide; EXV field of view with the outstanding clarity of a VIVID lens with Optics by ZEISS® so you can seek and destroy all the terrain that's in your view. ANTI-FOG COATING — Every Giro goggle lens features our anti-fog coating to keep your vision and riding experience on point. EVAK VENT TECHNOLOGY — Found exclusively on VIVID goggles models; EVAK Vent Technology uses a new foam made from an ultra-durable; non-absorbent material. EVAK vents minimize the chance of fogging by releasing moisture while simultaneously creating a barrier from the elements. EXPANSION VIEW (EXV) TECHNOLOGY — Perfected at Giro's test lab in Scotts Valley; California; this groundbreaking new frame design serves up unparalleled peripheral vision. We started with a helmet-compatible goggle; and then shaved down the frame rim and added frameless zones to optimize a massive spherical lens focused on the best possible peripheral vision in a goggle. INJECTION-MOLDED CYLINDRICAL LENSES — Injection-molding a cylindrical lens helps refine optics and minimize distortion that can occur in thermo-formed cylindrical lenses. VIVID LENS TECHNOLOGY WITH OPTICS BY ZEISS® — VIVID is a patented lens technology — developed by Giro in partnership with ZEISS® Optics — that improves the visual experience on snow by enhancing contrast and definition. VIVID Lens Technology effectively manipulates blue light by letting in contrast enhancing blue light; while blocking harmful UV light. VIVID essentially filters out the haze and frees your eyes to spot your line and focus on enjoying your riding experience.