Wim Hof explains the three degrees of frostbite and warns against pushing past your cold tolerance. A dermatologist told him his foot had irreversible damage that would require amputation, but he says controlled breathing healed it in six weeks, watching the color shift from purple to pink.
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First of all, I want to thank the community for asking questions. An inquisitive mind makes the darkness of ignorance go away. Frostbite is cell damage. You got first-degree, secondary-degree, and third-degree. Third-degree is irreparable cell damage. You're very able with the breathing to heal that. Make an estimate of how long you can go into the cold and don't exceed. Don't force the body. I know by experience. My left foot, where the dermatologist told me, this is irreparable cell damage over here and there, and in a few months it's going to be necrosis and it's going to be cut off. But no, it wasn't. So I began to breathe, and it took me a month and a half to heal the foot. I mean, it really looked not nice. Purple, blue, green, and then slowly to orange, red, pink again. And now look at my little feet. It's a crap feet. Let me get frostbite. Then breathe, go into the breathing and learn to control the amount of cold exposure you go into. You are able to do that very well.