What Low Hair Porosity Is (And How to Care for It), According to an Expert

Identifying and caring for this common hair type.

Sarah Monteil wears black sunglasses, oversized silver earrings, silver large chain necklaces, a navy blue with orange print pattern oversized silk shirt, high waist matching navy blue with orange print pattern large pants, outside the Thom Browne show, during Paris Fashion Week - Menswear Spring/Summer 2023, on June 26, 2022 in Paris, France. (
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When it comes to the care and keeping of hair—especially natural hair—there's far more to be concerned with than simply finding the right shampoo and conditioner. Great haircare is also about crafting a personalized routine that fosters scalp health, hydrated strands, and consistent hair growth. And in finding this routine, it's helpful to know about the needs of your hair and scalp, including whether your hair is low porosity or high porosity. 

"Porosity is the ability of the hair to absorb liquid," explains Alicia Bailey, a licensed master cosmetologist and the CEO and Global Hair Education Director of Iman Yvonne Beauty. "Hair that has low porosity has a tight cuticle layer, which makes it slightly harder to absorb water, products, and various chemicals."

Because of its unique characteristics, people with low porosity hair should gravitate towards certain products, ingredients, and practices, while staying away from others. Below, Bailey breaks down everything the low porosity hair owner needs to know about keeping those strands hydrated and healthy. 

Testing Hair Porosity

Identifying hair porosity isn't as easy or obvious as identifying one's curl pattern, hair thickness, or hair color—but that doesn't mean it has to be difficult. In fact, you can determine your hair porosity in a matter of seconds with one popular, tried-and-true test that involves only a cup of water and a piece of hair. 

First, wash your hair to ensure it's free of buildup and dirt. Then, after you've brushed it (but before you apply leave-in or styling products!), take a piece of hair from your brush, drop it in a glass of water, and wait awhile. 

After a few minutes, check the hair: If it floats, you have low porosity hair, and if it sinks, you have high porosity hair. It's easy as that!

Caring for Low Porosity Hair

Once you know that you have low porosity hair, the next step is to learn how to take care of it. This includes following universal tips like eating healthy, staying hydrated, washing hair as needed, and avoiding hair treatments or styles that damage or break hair. But there are also more specific products and routines to keep in mind when taking care of this often curly hair type.

"Hydrate the hair by incorporating conditioner, but accompanying the conditioner with heat," suggests Bailey. "The heat can be applied by using a plastic cap over the hair under a pre-heated hooded dryer, or a steamer without a cap. The heat allows the cuticle to expand and allows the conditioner to penetrate the hair strands."

Allow the conditioner to sit so that it has time to penetrate and deeply nourish hair. Then, she says, "I like to rinse the conditioner out with tepid water to help the cuticle close to lock in the much-needed moisture."

Furthermore, she recommends that people with low porosity hair opt for lightweight products rather than heavy ones, explaining that the latter option can "create a barrier and sit on top of the hair, making it difficult for the hair to absorb moisture." Similarly, she says to steer clear of silicones, which can lead to buildup, and to avoid high-protein treatments and products, because "adding additional protein to this hair type could cause the hair to become hard and will leave the hair more susceptible to breakage."

Below, products that do wonders for low porosity hair. 

Meet the Expert

Alicia Bailey
Alicia Bailey

Alicia Bailey is a licensed master cosmetologist and the CEO and Global Hair Education Director at Iman Yvonne Beauty with over 30 years of experience. She is also an author, life coach, and public speaker, and has owned salons such as Flawless Sessions Hair Salon in Georgia and Flawless Unisex Hair Salon in Hampton, Virginia. She has also worked as an educator for McBride Research Laboratories since 1999, and has worked with a number of women's magazines to promulgate education about black haircare. 

Gabrielle Ulubay
E-Commerce Writer

Gabrielle Ulubay is an E-Commerce Writer at Marie Claire and writes about all things beauty, sexual wellness, and fashion. She's also written about sex, gender, and politics for publications like The New York Times, Bustle, and HuffPost Personal since 2018. She has worked extensively in the e-commerce and sales spaces since 2020, including two years at Drizly, where she developed an expertise in finding the best, highest quality goods and experiences money can buy. As a film school graduate, she loves all things media and can be found making art when she's not busy writing.