In February, frosts in Siberia and the Urals reach -30 °C. Many people advise putting foil or cardboard under the insole – supposedly this reflects heat. In fact, this is dangerous: the foil does not heat, but prevents the leg from “breathing.” The moisture remains inside, the feet sweat, and when cooling, the humid environment accelerates frostbite. Cardboard and newspapers quickly become wet and stop working.
Feet get cold for two reasons: tight shoes interfere with blood flow, and moisture (even from sweat) dramatically accelerates cooling. Therefore, the main thing is dryness and free space.
What actually helps:
Socks made of wool or synthetics (not cotton – it holds moisture).
Shoes one size larger than usual – so as not to squeeze the foot.
A spare pair of socks in your pocket for long walks.
Movement: Stretch your toes every 10 to 15 minutes.
At temperatures below -25 °C, stay outside for no more than 15–20 minutes, especially with children. If the skin turns white or numb, immediately go into a warm place. No homemade insole can replace timely rest indoors.
