Cold temperatures, dampness, and wind increase the risk of hypothermia for runners. Sweat cools the body quickly during cold weather running. Wind evaporates sweat even faster and the body temperature may drop rapidly. The outer layer should protect the runner from wind, rain, or snow. Wear fabrics that insulate and wick moisture away.
Fabrics made of wool and polypropylene are good.
Avoid wearing cotton because it retains moisture. Protect special body parts like your head, face, hands, and feet. Mittens are better than gloves. Cover the head with a wool cap. Shield the face with a scarf or high collar.