The Clockwork RIG goggles utilize Sweet Protection's finest lens technology. The 2.8 mm thick main lens offers excellent contrast and minimal colour distortion, resultin in reduced eye fatigue. The Amethyst lens in this model hits category 2, and is suitable for overcast and somewhat dim conditions. They boats excellent contrast and light to moderate glare protection. Visible light transmission is 35%. This model performs very well in many uses, ranging from freeriding to Alpine racing. - One size fits most adults - Double lens - Gore Protective Vent between the lenses allows pressure differences to even out, thus eliminating any disformation of the inner lens - Inner lens with a Clear AF anti-fog treatment