The I/O MAG S is part of Smith’s top end MAG series but designed specifically for smaller faces. It uses their very latest technical features, including the MAG Quick Release lens changing system, so you can enjoy your day on the mountain. Coming with two lenses you are set for all conditions you are likely to encounter.Lens: ChromaPop Everyday Rose Gold Mirror + ChromaPop Storm Rose FlashVLT: 36% (CAT 2) + 50% (CAT 1)Size: Women\'s MediumLens Shape: SphericalMain LensChromaPop Everyday Rose Gold Mirror – With a 36% VLT Smith’s highly-versatile Everyday range of lenses are designed for medium to bright conditions with a mirror coating to reduce glare.Bonus LensChromaPop Storm Rose Flash – With a 50% VLT this lens is tuned to optimise contrast and increase definition when the storms come in and conditions deteriorate.Visual Light Transmission, VLT, refers to the amount of light that penetrates a lens. A low percentage means less light passes through and a higher percentage lets an increased amount of light through. A lens with a lower VLT rating is better for bright conditions, where as one with a higher VLT is more suited for overcast and snowy days.