UShake Snow Ski Goggles, Snowboard Skiing Goggles with Detachable Mirrored Anti Fog REVO Lenses and Helmet Compatible for Adult or Youth ICT (Integral Clarity Technology): Dual-PC spherical REVO lens with UV protection. Anti-fog treatment delivers crystal clear vision. Starting with a porous cellulose inner lens surface for superior water shedding above and beyond standard acetate lenses, we apply our chemically etched ICT anti-fog treatment for long-lasting clarity. Full Perimeter Channel Venting: Ensures maximum airflow, bringing fresh air into the goggle while pulling moisture away from the lens. FOG-FREE TPU FRAME&TRIPLE LAYER FACE FOAM: Variable density face foams utilize moisture wicking fleece that provides a perfect goggle-to-face fit, sealing out the elements while providing hours of riding comfort OVER THE GLASSES (OTG) COMPATIBLE: Offers a wide range of frames that can accommodate prescription eyeglasses(NOT for large frame) worn underneath the goggles.(Recommend contact lenses for safety still) ELASTC STRAPS & BUCKLE: make you more convenient to replace the strap.(HELMET COMPATIBLE) <span class="a-text-bold"><u>TPU flexible frame</u></span> is adopt to any face for a comfortable fit Dual lenses with anti-fog and anti-scratch protection 100 per cent UV protection <span class="a-text-bold"><u>Triple-layer face foam</u></span> featuring moisture-wicking Dri-Force fleece Easy fit strap adjustment system(Max Length: 70cm) Dual-adjustment, premium nylon strap Material: polyethylene Thickness: 15mm Material: TPU Color: Black, Red, Blue for options Material: PC Flat or Spherical: Cylindrical Color: Golden, Red, Silver colors Vents: yes Anti-UV: 100 per cent Anti-Scratch: yes Anti-Fog: yes <span class="a-text-bold"><span class="a-text-italic">S4</span></span>: VLT 0-8%   -for sunny day with strong sunshine surroundings. <span class="a-text-bold"><span class="a-text-italic">S3</span></span>: VLT 8-18%  -for sunny to partly cloudy day surroundings. <span class="a-text-bold"><span class="a-text-italic">S2</span></span>: VLT 18-42% -for overcast, cloudy,foggy day surroundings. <span class="a-text-bold"><span class="a-text-italic">S1</span></span>: VLT 42-79% -forlow lightsurroundings. Please avoid to touch the glass surface directly as it may get dirty. Please do not bend it too many times to avoid scratches on the frame. After using, put goggle at place in good ventilation for dismissing the sweat. Do not scrub the goggles frequently which may reduce the effectiveness of anti-fog film specifically the inner glass.