Of course you need, the anti-fogging performance is certainly crucial. We usually wear glasses to go out in winter, and they will fog that can affect the scope of our vision. It is very dangerous while skiing, so it is very necessary.
I think it is necessary. When you are skiing, being in the vast white snow, through the reflection by the snow of the sunlight, our eyes will be stimulated to be uncomfortable, so be sure to choose better anti-uv performance ski goggles and the uv protection of them is very important.