Here's what other sites are saying:
The Zeal Maniak Swatt goggles are ideal for cloudy days and night skiing. Lightweight, pliable and strong frames provide all-day comfort during long days on the hill. No Fog lens treatment is infused into the inner lens so it will never rub off. Passive Airflow System Ventilation allows in cool outside air and pulls out warm, moist air from inside, further reducing fogging. Lens provides complete protection against UVA, UVB and UVC radiation. Triple-density foam molds to your face for a secure fit, while also wicking away moisture to keep you comfortable. Yellow lens tint increases visual acuity in extremely flat and low light conditions; 43% visible light transmission (VLT). Orange lens is ideal for night-time use; 72% VLT. Sized to fit medium faces. Special buy.
Going downhill should be simple while you're wearing a pair of Zeal Optics Maniak Swatt Goggles.