Blue and green mirror lenses are a great pick for sunny to partly cloudy days, especially during spring skiing when the sun is intense and glare bouncing off the snow becomes a real issue. The cool tint reduces brightness while still offering moderate contrast, so you can read terrain features without feeling like you're wearing overly dark shades.
The mirror coating on these lenses does more than look sleek—it actively reflects additional light away from your eyes, cutting down on harsh glare from snow and ice. This makes them noticeably more comfortable on bright days when the sun is reflecting off every surface around you.
However, these lenses aren't your best bet for flat light, overcast days, or storms. If you mostly ski in variable or low-light conditions, a rose or copper tint will serve you far better. Think of blue/green mirror lenses as your dedicated bluebird-day option when glare protection is the priority.