Wear sunscreen skiing. Yes, even in winter.
Yes.
Snow reflects up to 80% of UV rays, so you’re getting hit from above and below. Altitude makes it worse — UV increases about 10-15% per 1,000 feet. You can absolutely burn on a cloudy day in January.
The wind and cold fool you into thinking you’re fine. You’re not. Lip balm with SPF too. Same logic.
Your face will thank you later.
