SWANS RIDGELINE is a snow goggle which has a wider visibility and distinctive ventilating function called “A-Blow System”. This product also can be used with wearing eyeglasses. SWANS peculiar anti-fog technology Premium Anti-Fog (PAF) is also applied to keep your visibility clearer. In addition, lens is detachable and convertible with spare lens which is separately sold. Photochromic ULTRA Light Purple lens is specialized lens for skiing and snowboarding. The feature of ULTRA lens makes the visibility clearer, for example making blur bumpy snow surface more difine during skiing or snowboarding. In the meantime, the photochromic feature changes the darkness of the lens depending on UV light amount, like from sunny day to snowy dark circumstance.