The all-new I/O combines a wider field of view, innovative Responsive Fit frame design, and updated looks. All while using your same proven lens. The spherical lens has 5X anti-fog, Smiths highest level of anti-fog technology, and TLT optics for crystal clear vision. The original I/O was the first goggle to solve the problem of what to do when changing light and weather demanded different lenses. The new I/O continues that legacy of uncompromising performance. Chromopop™ Snow lenses do more work. With just one Chromopop™ lens you experience enhanced definition and clarity accross a greater range of conditions than with traditional lenses. Features: Quick release lens change system Includes bright light and low light performance mirror lenses Chromopop™ Lenses Spherical lens 5X anti-fog inner lens TLT lens technology for crystal clear vision Patented Porex filter prevents optical distortion during changes in elevation Medium fit Responsive Fit frame design QuickFit strap adjustment system with clip buckle 3-layer DriWix face foam Helmet compatible Ultra-wide, silicone backed strap Articulating outrigger positioning system Includes microfiber goggle bag with replacement lens sleeve Lens: Chromopop™ Sun Green Mirror VLT = 9% Category = S3 Chromopop™ Storm Rose Flash VLT = 50% Category = S1