Heat-styling tools like blow dryers and curling irons degrade the hair shaft's protective layer, leading to brittle ends. Cold curling avoids this thermal damage by relying on moisture and physical fixation to reshape the hair.The process works because the protein structure of the hair changes shape when wet. By fixing a damp strand in a curved position and allowing it to dry completely, hydrogen bonds reorganize to lock in the new shape. Moisture must evaporate entirely before the fasteners are removed; otherwise, the weight of the hair will pull the curl straight.Hold depends on the base...

https://english.pravda.ru/news/women/168929-cold-hair-curling-secrets/

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