The first time I went on a ski trip (many years ago, and I took up a snowboard rather than skis), I was reading a book on internal medicine. It was by an Indonesian author, and he said that your core was what you needed to keep warm the most.
I think about that often, especially now in these winter months. Most people wouldn’t think it’s particularly cold in LA, not compared to other places. But it’s cold enough. And this year has been unusually wintery.
So, just like in those colder climates, it’s imperative to keep your body warm. Layering your clothes is the best way to retain heat and stay warm. Wear a thin base layer, like a long-sleeved shirt, followed by a thicker, insulating layer like a sweater and a waterproof outer layer. Just like that look book of internal medicine suggested.