Hair has three layers, the cuticle, cortex, and medulla. The cortex is the middle layer and it is where melanin (aka hair color pigment) resides. This is the layer that when damaged changes your hair elasticity, brittleness, and overall strength. The reason is it is where you find the bonds that create your hair’s overall strength. There are three main bond that create the strength of hair. Hydrogen bonds, salt bonds and chemical bonds. When your hair is wet it breaks all of the hydrogen bonds in your hair. They do get rebuilt as your hair dries, but while it is wet your hair has lost almost 1/3 of it’s support system. So when your hair is wet it is more susceptible to breakage. Avoid putting your hait up in pony tail’s, tight braids, and clips while wet.
Why is Hair More Prone to Breakage When It’s Wet?
***Thanks to Berry for asking this question***