A category 1 to 3 photochromatic lens works in many conditions: at its brightest, the lens transmits 75% of light, and at its darkest, the glare protection is at a level suitable for sunny summer days. Julbo cycling glasses are designed to work very well with cycling helmet straps.
Julbo has been making sunglasses for more than 135 years. By buying Julbo, you are investing in a quality product and can rest assured the glasses offer perfect UV protection.