The original Line Miner goggle was created with the purpose of providing the ultimate in peripheral vision, with a cylindrical-style design. We were able to pull the goggle in closer to your face than ever before, allowing for incredible downward and side-to-side periphery. With a mid-sized ?t, Line Miner XM is optimized for a wide variety of faces and is engineered to ?t perfectly with most helmets. Prizm is a revolution in lens optics built on decades of color science research. Prizm lenses provide unprecedented control of light transmission resulting in colors precisely tuned to maximize contrast and enhance visibility. PRIZM SNOW SAPPHIRE IRIDIUM - Light Transmission: 20%, Light Conditions: Bright Light, Contrast: Increased, Base Lens Color: Sapphire Features: Prizm Lens Technology Two lenses included Dual pouch microbag included for storage and lens cleaning Fit: Medium Switchlock® Lens Change System Wide 40mm wide adjustable strap with silicone lining for a more secure fit Flexible O Matter faceplate conforms to your face comfortably, even in extreme cold Low-profile frame design provides increased visibility and improved helmet compatibility All-day comfort of triple-layer face foam with moisture wicking polar fleece lining Injection-molded Plutonite® lens material provides 100% protection against UVA / UVB / UVC & harmful blue light up to 400nm Optically correct Dual-Vented Lens with F3 Anti-fog coating Meets impact requirements based on ANSI Z87.1 and EN 166 standards