Ranging from cat 1 to cat 3, these glasses will work in nearly all conditions: at their brightest, the lens permeates as much as 75% of light, while at their darkest they offer great glare protection. - Lens light permeability between 17 and 75%, cat1 ... cat3 - Lens made of Trivex plastic - Non temperature sensitive technology - Anti-fog treatment - Grip Tech elastomere and Grip Tech temples for great grip - Super wide views thanks to Panoramic View design 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.