The Wiley X Breach Polarized Sunglasses features a Dynamic Ventilation System allows you to control the airflow behind your lenses to reduce fogging. These Wiley X Breach Polarized Sunglasses protects eyes from fine dust, pollen, irritants as well as peripheral light, the lenses meet or exceed ANSI Z87.1 industrial standards for high-mass and high-velocity impact protection. The lenses are 100% UVA/UVB protection with distortion free clarity.