What hair porosity do you have?

Hair porosity refers to your hair's ability to absorb and retain moisture. This characteristic is determined by the condition of the cuticle layer—the outermost protective layer of your hair shaft. Think of the cuticle as overlapping scales that control how moisture and products enter and exit your hair strand.

The three main types of hair porosity are:

• Low porosity: Cuticles lie flat and tightly packed, making it difficult for moisture to penetrate the hair shaft. While slow to absorb moisture, low porosity hair tends to retain it well once hydrated.

• Medium porosity: Cuticles are slightly raised, allowing balanced moisture absorption and retention. This is considered the ideal porosity type, requiring less intensive maintenance.

• High porosity: Cuticles are lifted with gaps between them, allowing moisture to enter quickly but also escape rapidly. This can lead to dry, frizzy hair that's prone to damage.

Several factors contribute to your hair's porosity level:

Your natural hair structure and porosity are largely inherited. Some people are simply born with tightly sealed cuticles (low porosity) or more open cuticles (high porosity).

Excessive heat from traditional styling tools can damage the cuticle layer, raising the scales and increasing porosity. The Dyson Supersonic™ hair dryer helps prevent this with intelligent heat control that measures air temperature over 40 times per second. The Dyson Supersonic Nural™ hair dryer has Scalp protect mode which uses a network of Nural™ sensors, automatically reducing heat as it nears your head, helping protect your scalp from damage. 

Processes like bleaching, coloring, perming, and relaxing can disrupt the cuticle structure, often resulting in higher porosity. These treatments break down the hair's protein bonds, creating gaps in the cuticle layer.

UV rays, pollution, and fluctuating humidity can impact cuticle integrity over time. Protection from these elements helps maintain consistent porosity.

Particularly problematic for low porosity hair, heavy products can accumulate on the hair surface, further preventing moisture penetration and creating an imbalance.

For example, Dyson Airwrap™ multi-styler and dryer helps minimize porosity changes by styling with controlled, lower heat settings and the Coanda effect, reducing the need for extreme temperatures that can damage the cuticle layer.

Take a clean strand of hair and place it in a glass of water. Observe what happens:

• If it floats on top, you likely have low porosity hair 
• If it floats in the middle, you have medium porosity
• If it sinks quickly to the bottom, you have high porosity hair 

Take a strand of hair between your fingers and slide your fingers upward toward the scalp:

• If it feels smooth, you likely have low porosity
• If it feels slightly rough, you have medium porosity
• If it feels very rough or bumpy, you have high porosity

For a more precise assessment, you may consider professional hair analysis, but these home tests can potentially give you a preliminary understanding of your hair's basic porosity type.

Low porosity hair has tightly packed cuticles that create a barrier to moisture. This hair type:

• Repels water initially and takes time to become fully saturated 

• Tends to have product buildup as formulations sit on the surface rather than absorbing

• Dries slowly once wet, as water has difficulty both entering and exiting 

• Often appears shiny due to the smooth, flat cuticle surface

• May be resistant to chemical treatments and colour 

• Use lightweight, water-based products that won't create buildup

• Apply products to damp hair to enhance absorption

• Consider gentle heat to temporarily lift the cuticle for better product penetration

The Dyson Corrale™ straightener works well for low porosity hair as its intelligent heat control and flexible plates gather hair evenly, requiring less reliance on heat while still achieving effective styling. This controlled approach helps prevent raising the cuticle excessively, maintaining the hair's natural porosity level.

Medium porosity represents the ideal balance, with cuticles that are neither too tight nor too open. This hair type:

• Absorbs moisture at a moderate rate

• Retains moisture well without excessive dryness or greasiness

• Holds styles effectively and for a reasonable duration 

• Accepts chemical treatments predictably

• Requires less intensive maintenance routines

• Use balanced moisture-protein products to maintain optimal hair health
• Apply moderate heat settings when styling
• Focus on maintenance rather than correction

The Dyson Supersonic™ hair dryer with its precise heat control is particularly beneficial for medium porosity hair, helping maintain this ideal porosity balance by preventing heat damage that could disrupt the structure.

High porosity hair has raised or damaged cuticles with gaps that allow rapid moisture movement. This hair type:

• Absorbs water and products quickly 

• Dries rapidly as moisture escapes easily

• Tends to feel dry, frizzy, or brittle 

• Is prone to tangling and breakage

• May appear dull due to light scattering from the uneven cuticle surface 

• Use richer, heavier products that can seal the cuticle
• Apply leave-in conditioners and oils to lock in moisture. The Dyson Omega™ nourishing collection provides heat protection up to 450°F. 
• Minimize heat exposure to prevent further cuticle damage

Hair porosity needs can fluctuate with changing seasons, requiring adjustments to your care routine:

Winter care:

• Low porosity: Deep condition with a hydrating mask
• Medium porosity: Add slightly richer products to prevent moisture loss
• High porosity: Incorporate deep conditioning treatments and protective styling to combat dryness

Summer care:

• Low porosity: Use lightweight, humidity-resistant products to prevent buildup
• Medium porosity: Apply UV-protective products to maintain cuticle integrity
• High porosity: Use anti-humidity sealants and moisture-locking oils to prevent frizz

Understanding your hair porosity isn’t just a nice-to-know detail—it’s the foundation of a hair care routine that actually works for you. Whether your strands resist moisture or soak it up like a sponge, tailoring your products, tools, and techniques to your porosity level can make the difference between frustrating hair days and consistently healthy, manageable hair.

Once you’ve identified whether your hair is low, medium, or high porosity, you can start making smarter decisions: choosing ingredients that nourish rather than sit on the surface, selecting tools that protect rather than damage, and adapting your routine with the seasons to meet your hair where it is.

And remember—Dyson’s intelligent heat control technology is more than just a feature. It’s a way to respect your hair’s structure while still achieving salon-level results at home. From the Supersonic™ to the Corrale™ and Airwrap™, these tools work with your hair’s unique porosity—not against it.

So, what porosity do you have? Once you know, you’re no longer guessing. You’re working with your hair—not fighting it. And that’s the kind of confidence that starts from the root.