The Lowdown is undoubtedly Smith's signature pair of shades, and the Lowdown XL Sunglasses fit those with larger noggins or the rowdy radsters who simply want to see the bigger picture. Equipped with Chromapop, this pair filters two specific, unwanted wavelengths of light that cause eye fatigue and color confusion in order to deliver greater definition, more natural color, and unmatched clarity. In layman's terms, you'll see bluer skies, greener grass, and redder sandstone when you see the world through the Chromapop lenses in these stylish shades. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.