Cold, dry mountain air will damage skin faster than you can say windburn. This lube moisturizes, protects against wind and sun (30 SPF), and it won't freeze solid. It also stays on longer than other sunscreens we've tried, so fewer applications are needed–a key to effective protection when you're out all day.
This formula has transparent, UV-blocking zinc oxide, which goes on clear so you don't look like a lifeguard. Bonus: The .5-ounce tin slips into a pants pocket. $5; dermatone.com