This is the highest-grade model in the mont-bell Alpine Goggle series. Mont-bell's unique anti-fog system, which uses a double-lens structure and ventilation, suppresses fogging by controlling temperature changes and releasing moisture. Furthermore, this model uses photochromic lenses, so the lens tint automatically changes depending on the amount of UV light. It ensures a clear view in all conditions, such as sunny, cloudy, and snowy weather, making it suitable for skiing, snowboarding, ice climbing, and winter mountaineering. The following is quoted from the official website description: These goggles feature an anti-fog system and provide a clear view in all conditions. Equipped with ventilation, they are suitable for a wide range of activities, from alpine climbing to snow sports. They feature photochromic lenses that change color density according to changes in field conditions. Specifications: Weight: 128g Color: Red (RD) (Lens Color: Light Pink x Red Mirror) Visible Light Transmission: 20% - 70% Strap Width: 40mm Features: Lenses that change color density depending on the amount of UV light. The lens color darkens on sunny days with high UV light, and lightens in rough weather with less UV light. Suitable for long mountain expeditions. In addition, by placing the photochromic lens inside the double lens, it is less susceptible to the effects of cold air, achieving a smooth change in density.