Low-porosity hair, what causes it, the symptoms to look out for, and some effective hair care options. Hair Transplant in Rajouri Garden is available to help with poor porosity hair. Low porosity hair is usually caused by genetic causes. Using chemicals and heat on your hair does not usually result in decreased hair porosity. When heat or styling damage the cuticle layer, high porosity hair is more common. That means the cuticles are elevated and separated by spaces.