FYI - from skincancer.org Winter sports enthusiasts are at...

FYI - from skincancer.org

Winter sports enthusiasts are at increased risk for overexposure to the sun's ultraviolet (UV) radiation. The combination of higher altitude and UV rays reflected by the snow puts skiers and snowboarders at an increased risk of sun damage, and ultimately skin cancer. More than 90 percent of all skin cancers are associated with sun exposure.
"It's easy to associate winter with frostbite and windburn, but most people are unaware that UV rays can be every bit as damaging on the slopes as on the beach," said Perry Robins, MD, President, The Skin Cancer Foundation. "With the winter sports season ahead of us, it's more important than ever to take proper precautions on the slopes."
Higher altitude means increased risk of sun-induced skin damage, since UV radiation exposure increases 4 to 5 percent with every 1,000 feet above sea level. At an altitude of 9,000 to 10,000 feet, UV radiation may be 35 to 45 percent more intense than at sea level. In addition, snow reflects up to 80 percent of the UV light from the sun, meaning that you are often hit by the same rays twice. This only increases the risk for damage.