Vision Cylindrical Carbonic-x lens for clarity and impact resistance with built-in Airflow technology for active ventilation Fog-X anti-fog inner lens for fog-free performance Designed to fit over your glasses (OTG) Fit / Integration Designed for ultimate integration with Smith helmets for maximum comfort, venting and fog-free performance Dual-slide strap for easy size adjustment Silicone-backed strap stays put Two-layer DriWix face foam wicks moisture for a fog-free fit Floating foam membrane eliminates eyeglass temple pressure Youth medium fit Smith Daredevil Goggles + Blue Sensor Lens Kids