Hair Types Explained: The Type 1–4 System and What It Means for Your Cut

The hair typing system most commonly used today divides hair into four categories — straight, wavy, curly, and coily — each split into three sub-types labelled a, b, and c. The "a" sub-type is the loosest or finest expression of that category; "c" is the tightest or most defined. The system is a starting point, not a cage: many people have more than one type on their head, and the right cut depends on more than just curl pattern. But understanding where your hair falls in the system helps you communicate more clearly with whoever cuts it.

Type 1 — Straight hair

Straight hair (Type 1) has no natural curl or wave from root to tip. The cuticle tends to lie flat, which is why Type 1 hair is often the shiniest — light reflects directly off the smooth surface. The trade-off is that natural oils travel from scalp to ends without the interruption of a curl, which can make it look greasy faster.

What it means for your cut: Straight hair shows scissor and clipper work with absolute clarity. Blunt lines are very blunt; layers must be cut precisely or they will look choppy rather than feathered. For men, crew cuts, side parts, and slick backs work especially well because the hair lies exactly where it's placed. For women, a blunt cut or bob maximises the graphic impact of straight hair.

Product recommendations: Lightweight pomade, matte clay, or sea-salt spray for texture. Avoid heavy creams that make fine Type 1 hair look flat and greasy within hours.

Type 2 — Wavy hair

Wavy hair has a natural S-bend that begins at the root and becomes more pronounced toward the ends. It sits between straight and curly and behaves differently depending on whether the weather is dry or humid. Type 2a is barely wavy and can look almost straight when dry; Type 2c is close enough to curly that some Type 2c people find curly hair techniques work better for them.

What it means for your cut: Layers are your friend. Without them, wavy hair can look triangular — wider at the bottom than the top, which adds bulk in the wrong places. A layered cut, lob, or shag removes weight from the mid-lengths and lets the wave move freely. For men, the textured crop and quiff work well — natural movement does the styling work for you with minimal product.

Product recommendations: Sea-salt spray enhances the wave pattern without weighing it down. A light curl cream or mousse is useful for Type 2b and 2c to define and hold. Apply product to damp (not wet) hair and scrunch upward rather than raking through.

Type 3 — Curly hair

Type 3 hair has a defined spiral or ringlet pattern. The curl forms from the root rather than just at the ends, which means significant shrinkage — a 3a curl may lose 20% of its length when dry; a 3c curl can spring back to half its wet length. This is the most important practical fact to understand before a haircut: tell your stylist how much shrinkage your hair has, and ask them to cut it dry if possible.

What it means for your cut: The wolf cut and butterfly cut have become popular among Type 3 women because heavy face-framing layers enhance curl movement without creating bulk. For men, the broccoli cut and afro taper are built specifically around curly and coily texture. Always look for a stylist who specifically mentions experience with curly hair — a barber who only works in straight hair may cut your curls wet and leave you shorter than expected.

Product recommendations: A leave-in conditioner as a base, followed by a curl cream or gel scrunched into damp hair. Diffuse dry on low heat, or air dry completely without touching the hair while it dries (touching breaks the curl clumps and causes frizz). For daily care, see our hair care routine guide.

Type 4 — Coily hair

Type 4 hair is the most tightly coiled and shrinks the most dramatically — some 4c hair shrinks by as much as 70% when it dries. It is also the most fragile of the hair types: the tight curl pattern means natural oils struggle to travel down the shaft, making Type 4 hair prone to dryness and breakage if not moisturised consistently.

What it means for your cut: Type 4 hair is always cut dry by experienced specialists, who understand that what they see wet is not what the client will wear. The afro taper is one of the most requested men's Type 4 cuts, combining the natural volume of an afro on top with a gradually faded perimeter that keeps the shape sharp. 360 waves are a Type 4 styling technique rather than a cut. For shape and definition on longer Type 4 hair, a specialist who works with coily textures is essential — this is one case where finding a barber or stylist with specific experience is non-negotiable.

Product recommendations: The LOC method (Liquid — a water-based leave-in; Oil — to seal; Cream — to layer over) is widely used for Type 4 hair because it layers moisture and then seals it in. Avoid products with drying alcohols (listed as alcohol denat. or SD alcohol). Moisturise daily or every other day rather than waiting for weekly wash days.

Porosity: the factor the type system misses

The 1–4 system describes curl pattern, but it doesn't capture how your hair behaves with moisture and products — that's porosity. Low-porosity hair has tightly bound cuticles that resist absorbing water and product. High-porosity hair absorbs quickly but loses moisture just as fast. Most people with Type 3 and 4 hair have high porosity, either naturally or from colour and heat damage, but it can occur at any type.

Porosity affects which products work. If your products sit on your hair without absorbing, you probably have low porosity — apply product to very wet hair and use a little heat (hooded dryer, steamer, or even a warm shower cap) to help the cuticle open. If your hair dries out within hours of moisturising, you likely have high porosity — use heavier creams and butters, and consider protein treatments occasionally to temporarily fill gaps in the cuticle.