HD+ LENS TECHNOLOGY combines the superior clarity of our digitally mastered high definition lenses with the therapeutic and visual performance benefits of our patented Happy Lens. Enjoy enhanced color and contrast, improved mood and alertness, and distortion-free optics in one kick-ass package. Comes with a free premium bonus lens so youre covered in any light conditions.The anti-fog 5.5-base ARC spherical dual-lens with anti-scratch protection provides increased optical clarity and 100% UV protection, while the Lock Steady quick-change system lets you change lenses with the push of a buttonThe RISE ventilation system utilizes the Venturi effect to draw air through subframe vents above the goggle, creating a vacuum that pulls hot air from behind the lens. Pair that with the Triple-layer Isotron face foam with moisture-wicking Dri-Force fleece, and youll be sweat and fog free all day.Compatible with the most popular helmets on the planet and stays securely in place with a silicone-lined strap.