High porosity hair: signs, routine, and products

Signs of high porosity hair

Porosity is just how easily your hair lets water and product move in and out. On high porosity hair the cuticle, the outer layer of overlapping scales, sits raised and has gaps in it.¹ Picture roof shingles that have lifted at the edges. Water and product slip in quickly through those openings, but they slip back out just as fast. That single trait explains almost everything else about how this hair behaves.

You probably have high porosity hair if you recognize most of these:

• It dries very quickly, sometimes before you have finished your routine.
• It frizzes easily and tends toward dryness no matter what you try.
• It tangles and knots more than you would expect.
• It drinks up oils, creams, and leave-ins, yet still feels thirsty an hour later.
• The strands can feel rough or a little rugged when you run your fingers down them.

What causes high porosity

Your starting porosity comes from the natural structure of your hair, and damage can raise it from there. Some people simply have a naturally more open cuticle. But for most people, high porosity is earned over time through things that lift or wear down the cuticle. The more of these your hair has been through, the more porous it tends to become:

• Coloring and especially bleaching, which open the cuticle on purpose to work.²
• Frequent heat styling with blow dryers, flat irons, and curling wands.³
• Chemical relaxers and other strong chemical services.
• Sun and UV exposure over many seasons.¹
• Hard water may play a part: hair takes up minerals from tap water, which can leave it feeling stiffer, though hard water has not been shown to raise porosity itself.⁸
• Rough handling: aggressive brushing, tight styles, and harsh towel drying.⁴

The good news is that damage-driven porosity can be managed well. You cannot un-bleach a strand or truly restore a damaged cuticle, but conditioners, oils, and protein can smooth and protect it for a while. The only permanent fix is new, healthier growth and regular trims, so protect what you have while it grows in.

The high porosity routine

A routine that works for high porosity hair does two jobs in order: it strengthens and smooths the strand, then it loads the strand with moisture and locks that moisture in. Here is the shape of it.

• Use protein or bond-building treatments. Small hydrolyzed proteins such as keratin can get into the strand and reduce breakage, especially in damaged hair.⁵ Bond builders are marketed to repair bonds inside the hair; independent lab work so far shows a smoother surface but limited direct evidence of bonds being rebuilt,⁷ though many people still find them helpful on bleached hair. This is why high porosity hair so often does well with protein, while many people with low porosity hair find heavy protein leaves it stiff.
• Layer moisture, then seal it. Use the LOC or LCO method (explained below) so a water-based leave-in is followed by a richer cream and a sealing oil. The seal is the whole point for this hair type.
• Reach for richer textures. Heavier creams and butters such as shea, plus sealing oils like argan, castor, and jojoba, give high porosity hair the staying power it needs.
• Finish with a cool rinse if you like it. A cool final rinse is a popular finishing step. There is little evidence it seals the cuticle, but it does no harm.
• Mind humectants in humidity. Humectants pull water from the air. A common tip is that on open, porous hair this can mean frizz on humid days, so many people seal humectants under an oil or cream when it is muggy.
• Cleanse gently and do not over-wash. Harsh, frequent washing strips the little moisture this hair manages to hold. Space out wash days and lean on gentle or co-washing where it suits you.

Not sure whether you lean high or low? Compare against the low porosity hair routine, which is built around the opposite cuticle and a much lighter touch.

The LOC and LCO methods

LOC and LCO are two layering orders that both aim to lock moisture into the strand. The only difference is the order of the last two steps, and the letters tell you everything:

• LOC = Liquid, Oil, Cream. Start with a water-based liquid or leave-in, apply an oil, then top with a cream.
• LCO = Liquid, Cream, Oil. Start with the same water-based liquid, apply a cream, then finish with an oil as the outermost seal.

In both cases the liquid delivers the actual moisture, and the oil and cream are there to trap it. High porosity hair usually does best with heavier sealing, and many people with this hair type find that ending on an oil (the LCO order) gives the most lasting hold because the oil sits on the very outside and slows water loss.⁶ Try both and watch which one keeps your hair soft longest. There is no single right answer, only the one your hair prefers.

Ingredients to look for

You do not need a long shelf of products. You need the right few. When you read a label, these are the things that earn their place on high porosity hair:

• Hydrolyzed proteins for strength, since small ones such as keratin can get into the strand and reduce breakage.⁵
• Shea butter as a rich, holding moisturizer for thirsty strands.
• Ceramides, a common pick that many people find leaves the cuticle feeling smoother.
• Sealing oils such as argan, castor, and baobab to lock everything in as the final step.

If you are deciding whether your hair is calling for protein or moisture on a given week, the hair elasticity test is a quick way to read the strand and choose.

Products that work

Below are the kinds of products that suit high porosity hair, described by type rather than brand so you can match the idea to whatever is available to you. Look for these roles in your routine and pick the formula that fits your texture and budget.

Heads up: the links below are affiliate links. If you buy through them we may earn a small commission at no extra cost to you, and we pick by fit, not by commission.

Shopping by product type? See our high porosity guides to the best leave-in conditioner, protein treatment and deep conditioner.

Sources

The research behind this guide. Last reviewed 19 October 2026.

1. Osório F, Tosti A. Hair weathering, part 1: hair structure and pathogenesis. Cosmetic Dermatology. 2011;24(11):533-538. MDedge
2. Gavazzoni Dias MF. Hair cosmetics: an overview. International Journal of Trichology. 2015;7(1):2-15. PubMed
3. Lee Y, Kim YD, Hyun HJ, et al. Hair shaft damage from heat and drying time of hair dryer. Annals of Dermatology. 2011;23(4):455-462. PubMed
4. American Academy of Dermatology. How to stop damaging your hair. AAD
5. Malinauskyte E, Shrestha R, Cornwell PA, et al. Penetration of different molecular weight hydrolysed keratins into hair fibres and their effects on the physical properties of textured hair. International Journal of Cosmetic Science. 2021;43(1):26-37. DOI
6. Keis K, Huemmer CL, Kamath YK. Effect of oil films on moisture vapor absorption on human hair. Journal of Cosmetic Science. 2007;58(2):135-145. PubMed
7. Di Foggia M, Boga C, Micheletti G, et al. Structural investigation on damaged hair keratin treated with α,β-unsaturated Michael acceptors used as repairing agents. International Journal of Biological Macromolecules. 2021;167:620-632. PubMed
8. Evans AO, Marsh JM, Wickett RR. The structural implications of water hardness metal uptake by human hair. International Journal of Cosmetic Science. 2011;33(5):477-482. PubMed