Effortless Lens Swapping - Fast magnetic interchange design with 6 magnets, easily swap your lens out with a wide range of extra lenses for different light conditions (Extra lenses sold separately, including the Same Lens as Goggles, Polarized, Photochromic, Yellow, Clear options, etc). The side-clip locking system holds the lens in place securely while you are on the slope. Anti-fog and Clear Vision - Double-layer lens design and high-performance hydrophilic coating on the inner side reduce fog formation efficient ventilation system delivers maximum air flow inside the goggles, and keeps your vision clearer and fog-free. Wide Field of Vision - Curved spherical lens gives you an unobstructed & distortion-free view of the slopes through its high-quality, injection-molded polycarbonate lens. Anti-scratch and impact-resistant. Over-the-glass compatibility works with most prescription eyewear. Medium fit. Style: Anti Fog Visible Light Transmission The amount of light that reaches your eyes through the lens is called the visible light transmission (VLT). VLT(Visible Light Transmission) References: VLT 0-10% - For sunny days VLT 10-25% - For partially clouded to sunny days VLT 25-60% - For cloudy days and dusk VLT 60-90% - For night and heavily clouded days Goggle Care Tips 1. Do not touch, wipe and clean the lens with your finger or rough cloth to avoid stains or scratches. 2. Do not wipe the inner lens which will invalidate anti-fog function. 3. Cleaning the outer lens only uses the protective pouch provided or soft tissue to gently wipe away the dust. 4. DO not use mascara or other oily substance in case the lens gets dirty. 5. If snow or water gets into your goggles, shake them out first, then let it air-dry. 6. Always store your goggles in a protective pouch or goggle case at a dry & well-ventilated place when not in use.