Hiking for a long time in an extremely cold environment without carrying warm items is an extremely dangerous behavior, which can lead to hypothermia, frostbite and even life-threatening. **It is strongly recommended not to try this approach**. In the event of an emergency or special restriction, the following strategies must be adopted to minimize the risk： --- ###**Core principle: use the environment and the body to produce heat by itself** 1. **Dynamic warmth (continuous exercise)** - Maintain a low-intensity but continuous hiking speed and avoid sweating (sweat will accelerate heat loss). -Heat is produced through muscle exercise, but physical energy consumption and heat production need to be balanced. 2. **Temporary warmth of locally sourced materials** -**Dry insulation layer**: Fill the interlayer of clothing with withered grass, leaves, moss, etc. (Make sure it is dry). -**Windproof barrier**: Use snow, rocks or tree trunks to build a temporary windshield to reduce the wind chill effect. -**Snow cave/wind shelter**: Dig a snow cave in a deep snow area (the internal temperature may be more than 0°C higher than the outside world). 3. **Maximize body heat retention** -**Posture adjustment**: Curl up into a ball (reduce the exposed area of the body surface), and cover the armpits or groin (core area) with your hands. -**Breathing control**: Cover your mouth and nose with clothing to avoid the loss of heat directly exhaled. -**Avoid direct contact with the ground**: Sit on a backpack, branch or rock to reduce heat conduction and heat dissipation. --- ###**Extreme measures in emergency situations (survival only)** -**High-calorie foods are preferred**: If there are foods, give priority to the intake of fats (such as nuts and chocolate) to provide continuous energy. -**Peer mutual assistance**: Multiple people cling to their bodies to share body temperature, and wrap the group with outer clothing. -**Be alert to signals of hypothermia**: When trembling decreases and consciousness is blurred, immediate action (such as slapping limbs, forced movement) is required. --- ###**Important Warning** -**Risk of temperature loss**: When there is no warm equipment in an extremely cold environment, temperature loss may occur within 30 minutes to 2 hours. -**Absolutely contraindicated**： -Do not drink alcohol (blood vessel dilation accelerates heat dissipation). - Do not come into direct contact with metal or wet objects (fast thermal conductivity). -Do not stand still (unless you have found a completely sheltered environment). --- ###**Rational suggestion** You must bring basic thermal equipment (such as thermal insulation pads, emergency blankets, and waterproof jackets) for hiking in extreme cold. If you lose your equipment due to an accident, you should give priority to seeking shelter and sending out a distress signal, rather than forcibly continuing on foot. The safety of life is always higher than the itinerary goal.