Spherically shaped and constructed with dual lenses to create a barrier between the 2 temperatures to reduce fogging, the outer Carbonic-X lens resists scratching and enhances visual acuity and contrast while the inner lens adds durability and increases visual clarity. These snow goggles have a wide, silicone backed strap with a clip buckle in the back and strap articulation at the frame to fit with your helmet. Soft, moisture wicking DriWix Face Foam seals to your face and a self-adjusting split-V nose contours to your features. Claiming the Phenom as their best fitting goggle, Smith has packed these lenses full of innovative features to keep you skiing and snowboarding in any conditions and never have to worry about stopping to wipe down your lenses. Seriously, you don't want to lose any time on lens TLC when there's powder to be found on the mountain.