Potentially hypothermic situations must be managed before they become serious. Recognize the environmental conditions leading to hypothermia. Wear appropriate clothing for cold and wet conditions. Wear a hat at all times. Use polypropylene underwear to wick water away from the skin, wool on top and a wind- and waterproof covering.
Acrylic is better than wool for insulation in a dunking.
Physical fitness, continuous exercise, high-calorie food and a hot thermos of tea or hot chocolate will prevent the onset of mild hypothermia. Avoid exhaustion by knowing your limits. If you are lost, avoid panic and other energy-depleting activities. In wilderness settings, carry fire-starting materials and some form of improvisational shelter. Pack a VHF radio and know how to use the emergency Channel 16 to call for help.