During the summer, sunblock and your shades are some of the first things you grab other than your bathing suit. However you need to wear protection for your eyes when you’re playing outside in the winter too.
When you head to the mountains some people don’t think about goggles. It might be cloudy or overcast while you¹re playing, but the sun rays still get through. When it glares off the snow it makes it even worse. You know in the summer that you need to wear sunblock even when it¹s cloudy or overcast, so why not protect your peepers too with a pair of glam goggles?
This article in The Daily Times gives advice on what color lenses to pick explains what times are worst for the sun.