Typhoon's SUNSHIFT™ lens incorporates polarized photochromic lens technology - the lens tint fades or darkens based upon the intensity of sunlight that it is exposed to. The SUNSHIFT lens' polarization eliminates glare to prevent impairment of your vision while enabling you to see clearly. The goggle frame features Advanced Lens Replacement Technology which allows for quick lens changes on-the-fly. The SUNSHIFT goggle provides optimum performance in cold weather. Your face is protected from wind chill at high speeds when boating across frosty lakes or boarding through snow covered mountains. The triple-layer Neofoam™ provides optimum padding comfort while preventing moisture from seeping inside the goggle. Anti-fog ventilation keeps the lens clear all day long. The high density webbing of the ultra plush strap provides additonal comfort and is secured by a curved, quick-release buckle.