Here's what other sites are saying:
Weather conditions change daily while you ski or ride, and you shouldn't have to swap out your goggle lenses to accommodate. Check out the sick Zeal Detonator PPX Polarized Goggle. The Photochromic lens change whenever the light changes, so you get sweet clarity in low morning light and super sunny afternoon light. Ski powder or bask in the sun on the chairlift--the polarization cuts glare, and fulltime lens vents and fused anti-fog treatment keep out the mist.