These safety shooting glasses have a photochromatic lens in a lightweight frame suited for all-day wear. The Razor is made of a strong, but very light material and has heavy-duty spring-loaded hinges and soft silicone nose pads. HD Varia 65-25 photochromatic shooting glass lenses adjust to the light conditions with an exclusive lens technology capable of amplifying color and contrast. This produces crystal clear high-definition visual imaging along with simple but effective light management.