You don't need to worry about foggy lenses with the Wiley X Knife Polarized Sunglasses Top Down Ventilation Fog-Free technology. Designed for medium to large face shapes, this eyewear features multi-layer foam for added comfort and protection. These also have the patented Wiley X Removable Facial Cavity Seal Technology that ensures blockage against debris, sun, and wind, along with seamless hinges that increase overall longevity. Available with RX Rim System. Temple strap included. Exceeds ANSI Z87, 1-2003 High Velocity Standard. Imported.