Exercise generates body heat, which can cause premature fatigue and discomfort when trapped by too many heavy layers of clothing. You're probably overdressed if you don't feel slightly chilled during the first five minutes of your workout. Layer your clothing. The easiest way to avoid overheating and maintain comfort when the temperature dips is to wear layers of lightweight apparel. Body heat escapes through improper protection of the hands, neck, feet and head.
Mittens are better than gloves, which allow cold air to circulate around the fingers.
Up to 40 percent of your body heat can be lost through your head, so wear a hat. By dressing properly, you can avoid the two most dangerous conditions of cold weather - frostbite and hyperthermia.