Description OTG (OVER-THE-GLASSES) DESIGN - The Ski Goggles PRO features an OTG design that lets you wear your glasses under the goggles. All lenses are ANTI-FOG COATED & offers 100% UV400 PROTECTION. UNIVERSAL HELMET COMPATIBILITY - Extra long elastic strap ensures GREAT HELMET COMPATIBILITY with all helmets. Suitable for both adults & teens. ANTI-FOG AND CRISP VISION - Double-layer PC lens design and high performance hydrophilic coating on the inner side minimize the chance of fogging. Venting windows at the top and bottom generate efficient air circulation to further ensure fog-free vision. ADDITIONAL FEATURES - Anti-slip silicone backed and helmet compatible strap, over-the-glasses design, triple layer foam, strong and flexible TPU frame, anti-scratch and impact-resistant lens; medium-to-large fit. VLT (Visible Light Transmission) Reference Scope VLT 0-10%: For sunny days VLT 10-25%: For partially clouded to sunny day VLT 25-60%: For cloudy days and dusk VLT 60-90%: For night and heavily clouded days Lens Color & VLT Clear: VLT=90.0% Grey: VLT=27.3% Colored: VLT=21.5%