Which hair texture tends to be the most porous?

Curly hair tends to be the most porous hair texture due to its unique structure and the way it interacts with moisture. The bends and twists in curly hair create more surface area, which allows for increased absorption of water and other products. This increased porosity can lead to the hair being more susceptible to damage from environmental factors and chemicals, as it can more readily absorb substances that may affect its health and integrity.

In contrast, straight hair typically has a smoother cuticle layer, making it less porous and more resistant to moisture absorption. Wavy hair has characteristics that fall between straight and curly, but generally does not exhibit the same level of porosity as curly hair. Coarse hair, while it can be strong and resilient, often has a thicker cuticle that can limit moisture penetration, meaning it does not necessarily have the same porosity as curly hair. Thus, curly hair's structure accounts for its high porosity level, making it the correct choice.