Bolle Nova II Googles Modulator light control lens is made with trivex material, an optically superior lens material that provides extreme impact resistance Outer lenses are sheathed in a protective armour to prevent scratches, keeping your lenses and outlook as clear as a bluebird sky Double density : a medium density foam backs up a soft micro-fleece face layer The Bolle unique double lens design creates a thermal Barrier, while providing exceptional Optics and a superior Seal Embedded premium Anti-Fog layer in the inner lens disperses water molecules across the surface of the lens, restricting moisture build