Fogged up lenses are annoying, but let's be honest, they can be downright hazardous. Simply put, if you can't see what you're doing you could wind up in a jackpot in the blink of an eye, and we ain't talkin' about the Powerball.Introducing Heat Wave Anti Fog Tech on our HUGE XL Vise® frame. Each pair features a dual surface lens coating that prevents condensation from forming, ensuring your vision stays crystalline and your glasses stay on. Boasting the same great features as the standard Vise®, The XL version is the first pair of (you guessed it) EXTRA-LARGE Heat Wave frames specifically designed for the ones with larger than average heads. We took the time-tested design of the Vise® and added an extra 10mm in width and jacked up the ride height to 5mm to provide Godzilla-like, larger than life comfort and coverage. About The Vise® Z87: features an all TR90 construction and tightly holds form and function together, as the Vise® Z87 meets ANSI Z.87 mass-impact requirements (and Z87+ with add on side-shields) featuring 1.9mm thick lenses to aid in protection against basic impacts and flying debris, which enables the Vise® to transcend just that of a regular pair of sunglasses. Meets Z.87 Requirements, and Z87+ with add on Side Shields Our lenses are injection molded from thick 1.9mm shatter-resistant polycarbonate that is built to withstand Z87 Mass Impact Standards. Add on optional side shields for additional lateral protection to meet Z87+ standards Each pair of Vise® Z87 is boldly marked Z87 on the frame, arm and lens. Disclaimer: Removing arms, and or changing configuration in any way voids Z87 compliance. Lens Technology: 1.9mm thick Polycarbonate lens that meets or exceeds impact requirements for Z80.3 standards, injection molded to the highest standards and tested to ensure optimal clarity, along with color and light transmission standards. Heat Wave ANTI-FOG glasses feature anti-fog treatments on both sides and are 100% guaranteed to remain fog free. Due to the nature of anti fog lens coatings, extra care should be taken to ensure that glasses are cleaned properly and free from debris. Only use provided microfiber to clean lenses.Lenses are U6:L3 UV400 - 100% UVA / UVB blockingClear Lens VLT = 96% / Cat 0