What hair types are more likely to be porous?

Hair types that are more likely to be porous typically include curly and coily hair. These hair types often have a more irregular cuticle structure, allowing moisture and products to penetrate more easily. Additionally, chemically treated hair, such as those that have been dyed, relaxed, or permed, can also exhibit higher porosity due to damage to the cuticle layer. In contrast, straight hair tends to be less porous and retains moisture more effectively.