Heat-Free Curls
A: Well, as we've explained here on Hairfinder many times, the hair contains both physical and chemical side bonds.
So, you can set curls into your hair without using heat by simply using a wet roller set. And even better is the fact that you can find rollers to give you a variety of types of curl - from the standard croquignole where the curl is wound over itself, to spiral curls that are evenly sized loops that hang down.
All you have to do is to wash the hair (or simply wet it), apply your favorite styling product and wrap the hair onto the rollers of your choice. Once wrapped, you allow the hair to dry naturally (which will take some time) or you can use a hooded dryer on a cool setting to speed up the process. Once dry, the hair will hold the new curly shape until you shampoo it again or until it gets too moist.
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See also:
How to style hair
Wet set tools to curl hair
Hair styling without appliances
Curling iron and flat iron damage