Wiley x PT-1 is one of Wiley x changeable series that has an unbreakable nylon frame. It has the best quality that its lens tints allow you to change specific lens tints for various light conditions. These branded safety glasses have polarized lenses that provide glare-free peripheral vision. Their ANSI Z87 safety standard will give you safety satisfaction and peace of mind. They have custom nose pad and its rubber compound can be easily adjusted for all nose sizes. Their rubber ear tips are designed for better grip around your head. Even they stick with your head if body temperature arises.