Mineral sunscreen, your new bff.
Let's start with the most basic and important rule, DON'T FORGET YOUR SUNSCREEN. It has been believed for years that sunscreen is only effective when applied during warm wether, or "when sunny in California", but no! You need sunscreen EVERY DAY OF YOUR LIFE, including under cold weather. Yes, you read correctly, low temperatures have a huge impact on your skin too, not only for the freezing air but from the reflection that comes from the snow. To this day no sunscreen had o