Low porosity - Hair with low porosity has a tightly bound cuticle layer with overlapping scales that lay flat. This type of hair is usually considered healthy, and is often very shiny, especially when it's dark in color. Low porosity hair repels moisture when you try to wet it and is hard to process since it resists penetration of chemicals. Low porosity hair is also prone to build-up from protein-rich deep conditioning products, which can leave it feeling stiff and straw-like. Stick to protein-free, daily conditioners with humectants such as glycerin or honey. Use moderate heat with protein-free deep conditioning treatments to help open up the tightly bound cuticle. Low porosity hair requires moisturizers rich in emollients such as shea butter, jojoba oil, coconut oil and mineral oil. It also benefits from humectant products, which attract and hold moisture to your hair. Choose lighter, liquid-based products such as hair milks that won't sit on your hair and leave it oily or greasy.

Low density - If you have low hair density, use light products that won't weigh your hair down and reduce its volume. Use a mousse to make your hair look fuller, and consider using dry shampoos, volumizing shampoos and volumizing conditioners with thickening agents. Simple, rounded hairstyles will also allow your curls, waves or coils to fall into place and give the appearance of more volume.

Fine width - Hair with fine width has a very small circumference and is very delicate and easy to damage. As a result it's often difficult to maintain length with fine hair. Deep conditioning after you wash is a good way to nourish and strengthen fine hair. You'll also want to keep manipulation of your hair to a minimum to avoid unnecessary breakage by reducing your use of combs and brushes and steering clear of elaborate, high-maintenance hairstyles.