With resistant porosity, how are the cuticles typically described?

In the context of hair porosity, especially with resistant porosity, the cuticles are typically described as smooth. This characteristic indicates that the cuticle layers lie flat and are tightly packed, which helps to form a barrier that reduces moisture absorption. Smooth cuticles prevent external moisture and products from easily penetrating the hair shaft, making the hair less absorbent and potentially more difficult to alter with chemical processes.

When hair has resistant porosity, it often exhibits fewer signs of damage, such as frizz or split ends, since the smooth cuticles protect the inner structure of the hair. This is in contrast to porous hair types, where the cuticles may be lifted or uneven, allowing for higher moisture absorption but also leading to potential issues with product retention and chemical services.