A versatile frame design inspired by today's modern consumer, Portal X can work for a variety of sports, yet it is also equally well suited off the field of play. Premium materials, Prizm optics, and stylish, mainstream details make this an excellent collection for those seeking all-day comfort in eyewear that is inspired and created to deliver exceptional clarity and lasting comfort.Features: - O Matter™ frame material provides durability and all-day comfort to keep up with life on-the-go- Unobtainium® on the inside of the earsocks and nosepads increase grip when wet to help keep the eyewear securely in place- Available with Prizm™ Lens Technology that is designed to enhance color, contrast so you can see more detail- Available with Oakley Authentic Prescription LensesSpecifications:- Light Transmission: 17%- Light Conditions: Bright Light- Contrast: IncreasedTechnology: PRIZM™ LENSES:- Oakley's exclusive lens technology designed to enhance color and contrast so you can see more detail.