Julbo Eyewear Unisex Tensing Flight - Interchangeable Zebra and Polarized Lenses Imported Plastic frame Plastic lens Non-Polarized 2" high Zebra lens is photochromatic so it gets darker or lighter in accordance with light intensity in a short 22 seconds Total Coverage: no wind in eyes but the side ventilation helps prevent fog Two elastic strap sizes are provided to accommodate different size heads Fits small to medium face The exceptional anti-fog coating prevents condensation and is built into the lens for maximum longevity