When it comes to creating a haircare routine that actually works, understanding your hair’s porosity can be game-changing. If you’re worried that hair porosity sounds like another viral TikTok trend, don’t be! It is a simple but useful concept that describes how well your hair absorbs and holds moisture. This means it can have a big impact on how your products perform and how long your hairstyle lasts. So whether you have curls, coils, waves or straight strands, your place on the porosity scale matters. It can help you choose the right products, avoid unnecessary damage and give your hair exactly what it needs. In this article we explore how to test your hair’s porosity level and what it means for your haircare routine.
What is Hair Porosity?
The concept of porosity is not new and plays a big role in how our hair behaves. Hairdressers and trichologists have long used it to explain issues like dryness, frizz or poor product absorption. In simple terms, it is your hair’s ability to absorb and retain moisture. This is largely determined by the condition of your hair cuticle, which is the outermost layer of the hair shaft. The cuticle is made up of overlapping scales (a bit like roof tiles). How tightly these scales lie decides whether your hair lets moisture in, struggles to absorb it or sits in between. Whilst your porosity level is influenced by genetics, it can also be affected by external factors. Things like heat styling, colouring and even the weather can change it over time.
Different Hair Porosity Levels
Porosity affects how your hair behaves and what it needs. Traditionally, it falls into three categories: low, medium and high. Each level has distinct traits, from how well it holds moisture to how it responds to styling:
- Low porosity: this has a tightly sealed cuticle layer, which makes it resistant to absorbing moisture and product. Water tends to bead on the surface rather than soak in, and heavy products can build up easily. Low porosity hair can feel smooth and look healthy, but often takes a long time to dry. It usually needs help (like heat or steam) to let moisture in.
- Medium porosity: often the “ideal,” this has a more open cuticle, so moisture goes in and stays put easily. It tends to respond well to most products and holds styles with ease. Whilst it still benefits from regular care, this hair type is generally low-maintenance and less prone to breakage or buildup.
- High porosity: this has gaps or holes in the cuticle, either naturally or due to damage from heat, colouring or over-styling. It absorbs moisture quickly but loses it just as fast, so it is prone to dryness, frizz and breakage. This type often needs rich moisturising products and protein treatments to strengthen and seal the hair shaft.
How to Figure Out Your Hair Porosity
Knowing where your hair falls on the scale helps you choose the right products, prevent damage and improve how it looks. There are several ways to test it, although none are definitive and all need careful interpretation. The main at-home porosity tests are:
- Float test: place a few strands of clean, dry hair into a glass of water. If the hair sinks quickly, it has high porosity. If it floats, it has low porosity. If it hovers in the middle, it has medium porosity.
- Spray bottle test: this is probably the easiest of the tests. Spray water onto a section of dry hair. If the water beads up and sits on top, it suggests low porosity. If it absorbs quickly, it hints at high porosity.
- Slip and slide test: this is an indirect test, as it checks the cuticle’s structure. Slide your fingers up a hair strand toward the scalp. If it feels smooth, the cuticle scales are likely tight and the hair has low porosity. If it feels rough or bumpy, the scales are likely loose and the hair probably has high porosity.
Best Haircare Tips for Each Porosity Level
Once you know your hair’s porosity, you can start building a routine that actually works for it. Each type has different needs when it comes to moisture, product absorption and overall maintenance. The key is to work with your hair’s natural structure rather than force results. Here is how to look after your hair based on its porosity:
- Low porosity: because this resists moisture, the goal is to open the cuticle just enough to let hydration in without weighing it down. Heat, like steam or a warm towel, can help treatments penetrate more effectively. Stick to lightweight, water-based products and avoid heavy oils or butters, which can sit on the surface and cause buildup. Using a clarifying shampoo regularly also helps remove residue so moisture can get in.
- Medium porosity: this tends to be the easiest to manage, but don’t neglect it, as it still benefits from balance. Keep a consistent routine with regular deep conditioning and occasional protein treatments to maintain strength and elasticity. This type usually tolerates heat and styling well, but still protect it from overexposure and harsh chemicals.
- High porosity: this type does not just need moisture, but also help holding onto it. Rich leave-in conditioners, creams and sealants like coconut oil or butters can help lock in hydration and smooth the cuticle. Protein treatments are also important, as they strengthen the hair shaft and fill in gaps in the cuticle. Try to limit heat styling and chemical treatments, which can increase porosity over time.
Whether your hair repels water or soaks it up like a sponge, understanding porosity helps you build a haircare routine that works. Identifying whether it is low, medium or high helps you select the right products and treatments for healthier, more beautiful strands.
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This article is intended for general informational purposes only and is not a substitute for medical advice, diagnosis or treatment. Always consult a qualified medical professional with any concerns about your hair or treatment options.
