By Alex Prewitt Boots, goggles and down jackets are all important pieces of equipment, but it’s skincare that reigns supreme when it comes to managing the mountain elements. One morning in mid-December 2021, U.S. freestyle skier Hannah Soar was waiting at the top of the moguls course in Huez, France, for the start of a World Cup event when she realized that she had forgotten a critical part of her preparation. “I was like, ‘Holy s—, I don’t have my sunscreen,’” Soar, 22, says. Thankfully, though, the panic proved brief: One of her coaches happened to be carrying a spare stick of high-SPF stu…