Before repairing the appearance of damaged hair, it is important to understand its structure. Cuticle, cortex, lipids: three elements that alone determine the strength, shine, and suppleness of the hair fiber. It is on this precise anatomy that BLOWN constructs each of its biomimetic complexes.
In brief: the 3 levers of hair health
- Cuticle: protects the fiber and directly influences shine
- Cortex: determines strength and elasticity
- Lipids: ensure the cohesion of the scales and softness to the touch, both on the surface and in depth
Hair anatomy: three layers, one logic
Hair is not a homogeneous material. It is a structure organized in concentric layers, each with a distinct role.
The cuticle: the protective shield
The cuticle is the outermost layer of the hair. It is composed of overlapping keratin scales, much like roof tiles. When properly flattened, they form a smooth surface where light reflects uniformly. This is what gives the effect of shine. When lifted or damaged by heat, friction, or repeated coloring, they make the surface irregular: the hair appears dull, feels rough to the touch, and is difficult to detangle.
The cuticle has a second, often underestimated function: it retains moisture and active ingredients inside the fiber. When altered, it allows them to escape faster than they should.
The cortex: strength and elasticity
Beneath the cuticle is the cortex, which represents the majority of the hair's volume. It contains keratin fibers organized into chains, held together by bonds (hydrogen, disulfide, ionic). These bonds give the hair its mechanical strength and elasticity, and it is the cortex that determines whether a hair bends without breaking, or snaps cleanly.
Repeated aggressions – chemical, thermal, mechanical – weaken these internal bonds. The hair loses elasticity and becomes brittle, and breakage is concentrated on the lengths and ends, where it has been most exposed over time.
The medulla: the heart, in filigree
At the center, the medulla plays a more marginal role in the visible health of the hair and is not the target of hair care. The essential cosmetic action focuses on the cuticle and cortex.
The key role of hair lipids
The layered structure alone is not enough to explain hair health: lipids play an equally decisive role, on two distinct levels.
The surface lipid film
On the outside of the cuticle, a lipid film naturally covers the fiber. It acts as a barrier against friction and dehydration, and directly contributes to the feeling of softness and the shiny effect. Frequent washing, heated tools, and UV exposure gradually alter it, exposing the cuticle.
The intercellular lipids of the cuticle (CMC)
Deeper down, intercellular lipids, particularly ceramides, ensure cohesion between the cuticle scales, much like cement between tiles. When this lipid cement becomes depleted, the scales separate more easily: this is one of the main causes of split ends and a rough feel to the touch.
Why damaged hair loses its structure
Three mechanisms generally combine in damaged hair:
- the cuticle lifts and loses its surface lipid film;
- the intercellular lipid cement becomes depleted, weakening the cohesion of the scales;
- the internal bonds of the cortex break, reducing elasticity and resistance to breakage.
It is this combination that explains why effective hair care cannot be limited to a single level of action. It must act on the surface (cuticle, lipids) and in depth (cortex) to achieve visible and lasting results.
BLOWN's biomimetic approach
It is precisely this anatomy that structures the architecture of BLOWN complexes. Rather than offering a single agent, each formula combines several active ingredients targeting the different levels of the fiber:
- CUTICLE-SEAL: a synergy of a cationic plant conditioner and a pH-Gloss, helps to smooth the fiber and facilitate detangling.
- KERA-LIPID: a combination of amino acids and plant peptides, hydrolyzed collagen and five oils (shea, coconut, castor, avocado, jojoba), nourishes the fiber and helps to repair its appearance.
- HYDRA-SILK: based on hyaluronic acid and plant polysaccharide, helps to hydrate the fiber for a silky touch without weighing it down.
- HYDRO-SEAL & REPAIR: in the Leave-in Detangler, combines amino acids, plant peptides and plant-derived squalene to help repair the appearance of ends and reduce breakage related to styling.
This biomimetic logic responds to a simple conviction: the hair is not covered with an artificial film, it is restored in what it lacks, at the level where it truly needs it. This is the intelligence of BLOWN: each active ingredient has a role, and nothing artificial.
FAQ: Hair Structure, the essentials
What is the hair cuticle?
The cuticle is the outer layer of the hair, composed of overlapping keratin scales. It protects the fiber and directly influences shine and softness to the touch.
What is the role of the cortex in hair strength?
The cortex makes up the bulk of the hair's volume. It contains the keratin chains responsible for the fiber's elasticity and mechanical strength. It determines the hair's ability to bend without breaking.
Why are lipids essential for hair health?
Lipids act on two levels: a surface film that protects against dehydration and friction, and intercellular lipids that ensure the cohesion of the cuticle scales. Their depletion directly weakens the fiber.
How does biomimetic care act on hair structure?
Biomimetic care targets the different levels of the fiber – cuticle, lipids, cortex – with active ingredients specific to each function, rather than a single agent covering the surface. This is the approach developed by BLOWN through its proprietary complexes.