The Zeal Forecast Photochromic Goggles don't care if the forecast calls for snow or sun or both. They don't care if the light is flat, glaringly bright, or downright dark. The polarized Automatic lens on these goggles adapts to changing light conditions, which means you can stay out on the slopes instead of heading out to the parking lot to grab your other pair. Zeal's proprietary anti-fog lens infusion lets these puppies sit close to your face without fogging up, giving the medium-sized frame the peripheral vision capabilities of much bigger, spaceman-style goggles. 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.