Dirty dog goggles are fitted with polycarbonate lenses that have been treated with a specially developed anti fog coating for mazimum clarity in the harhest conditions cvaft custom venting air flow technology gives extra protection against lens fogging super soft triple density face foam materials tested to 20 degrees polyester elastic strap with anti slip silicone bead anti uv colours large fit greyred fusion mirror lenses offers strong glare reduction for very bright conditions cat 3 len