In the Andes, the real skill is heat regulation. The middle layer is the thermostat of the system: too much closed up and you overheat, too much open and you lose efficiency fast when wind or weather arrives. The mistake is waiting until you already feel hot. By then: the base layer is wet, heat is trapped, and the next environmental transition becomes dangerous. Vent early. Adjust continuously. Stay ahead of the sweat curve. Thermoregulation is not static clothing. It is active systems management.

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