During very hot and humid spells, exercise in the cool indoors or go swimming. The body needs time to acclimatize to hot weather. It takes 7 to 14 days to fully acclimatize, so gradually increase your exercise time. The outer layer should protect the exerciser from wind, rain, or snow. Cold temperatures, dampness, and wind increase the risk of hypothermia.
Sweat cools the body quickly during cold weather and wind evaporates it faster.
Wear fabrics that insulate and wick moisture away. Fabrics made of wool and polypropylene are good. Cotton retains moisture and is not recommended for cold and wet weather. Protect special body parts like your head, face, hands, and feet. Mittens are better than gloves.