The I/O goggle by Smith combines tons of technology with great looking style. This is the future of goggles and they have been moving quickly in our stores. The I/O comes with 2 lenses, the Sensor Mirror for cloudy days and the Ignitor Mirror for those brighter days. Theses are some of the best spherical lenses out there using technology like, carbonic- X lens with TLT optics and the Porex filter that eliminates fogging. It does not matter if you do not know what that means, just know they functions extremely well. This goggles fits great and integrate perfectly with Smith’s Vantage and Variant Brim helmets.