Curl types from 2A to 4C: how to identify yours
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2B, 3A, 4C… If you are interested in curly hair, you have surely come across these mysterious codes. They correspond to a very widespread classification that describes the shape of hair, from a simple wavy movement to the tightest spirals. Knowing your curl type allows you to better understand your hair, find suitable advice, and choose consistent products. But this classification also has its limits, and it should not be taken as an absolute rule. In this article, we explain how the 2A to 4C scale works, how to identify your curl type, and what to take away from it for your routine. An ideal first step before diving into our complete curly hair guide.
1. Where does the hair type classification come from?
The best-known classification divides hair into four major families: type 1 for straight hair, type 2 for wavy hair, type 3 for curly hair, and type 4 for coily hair. Each type is then subdivided into A, B, and C, from the loosest to the tightest pattern.
It was popularized by the hairdressing world, then widely adopted by natural and curly hair communities online. Its great advantage is that it provides a common language: when someone says they have 3B curls, you can quickly visualize the shape of their hair and share suitable tips.
It is based solely on the shape of the hair, that is, the diameter and regularity of the curl. It says nothing about the thickness of the hair, its density, or its porosity, which are nevertheless essential criteria for choosing products. This is why it is used as a starting point, not as a complete diagnosis.
2. Wavy hair: types 2A, 2B, and 2C
2A. The hair forms a slight S-shaped movement, soft and subtle, especially on the lengths. The roots are often almost straight. This hair is easily weighed down by products that are too rich.
2B. The S-shaped waves are more defined and start higher up on the head. Frizz appears easily in humid weather.
2C. The waves are deep, almost curly in places, with a few spiral strands. The hair is often thicker and prone to frizz.
Wavy hair is often misidentified: many women think they have straight and "rebellious" hair, when they actually have waves broken by dry brushing. Wavy hair likes lightweight products, gentle detangling, and a little moisture to form its movement. A mist brush can help revive these waves in the morning without weighing them down.
3. Curly hair: types 3A, 3B, and 3C
3A. Large, well-defined curls, with a diameter comparable to that of a thick piece of chalk or larger. They are shiny and flexible, but easily lose their shape if handled too much.
3B. Tighter curls, the size of a marker, numerous and voluminous. The hair has a lot of body and can become dry on the lengths.
3C. Very tight, corkscrew curls, the size of a pencil. They are dense, voluminous, and need a lot of hydration.
Type 3 hair cannot withstand dry brushing, which turns curls into a fuzzy volume. It is detangled on damp hair with a product, then the curls are defined with fingers or a brush styling technique. Our method for detangling curly hair without breaking it is particularly suited to it.
4. Coily and kinky hair: types 4A, 4B, and 4C
4A. Small, tight S-shaped curls, well-defined, the size of a knitting needle. They have a dense and soft appearance.
4B. The hair forms Z-shaped angles rather than regular spirals. The curls are less visible and the hair is very dense.
4C. Very tight pattern, sometimes barely visible to the naked eye, with significant shrinkage: the hair appears much shorter than it actually is.
Type 4 hair is often the most fragile, because every curve is a weak point. It requires very gentle detangling, always on damp hair coated with a product, in small sections, with fingers then a wide-tooth comb. Protective hairstyles and regular hydration are their best allies.
5. Identify your type and adapt your routine
Do the test on clean hair. Wash your hair, apply conditioner, rinse, then let it air dry without any styling product and without touching it. Then observe the shape of the strands in different areas of the head.
Accept the mix. It is very common to have several types: 2C waves on top and 3A curls at the nape of the neck, for example. Simply adapt your actions to the areas concerned.
Look beyond the curl. The thickness of your hair (fine or thick), its density, and its porosity influence your needs as much as the shape of the curl. Fine 3B hair will not have the same needs as thick 3B hair.
Remember the common principles. Whatever your type, wavy to coily hair shares basic needs: hydration, detangling on damp hair, drying without rubbing with a microfiber towel, protection at night. The tighter the curl, the more important these steps are.
Adapt the richness of the products. Lightweight products for types 2, more nourishing products for types 3, rich products and sealing for types 4.
For tools, our comparison steam brush or mist brush explains why heatless tools better respect the shape of the curls.
Conclusion
The classification from 2A to 4C is a practical tool to put words to the shape of your hair and find suitable advice. But it does not tell everything: thickness, density, and porosity matter just as much. The most important thing is to observe your hair and adapt your actions gently. To detangle and revive waves and curls daily without heat, discover the Ambralya detangling mist brush, and find all our tips in our curly hair guide.
FAQ: curl types
Can you have several curl types?
Yes, it is even very common. Curls are often tighter at the nape of the neck and looser on top of the head.
Can my curl type change?
The natural shape can change over time or with hormonal variations, and curls can flatten if the hair is damaged or heavy. Good hydration often reveals more curls.
How do I know if I have wavy or straight hair?
Let your hair air dry without brushing it. If it forms S shapes, even slight ones, you probably have type 2 wavy hair.
What brush for 4C hair?
Start with fingers and a wide-tooth comb on damp hair coated with a product, then a very flexible detangling brush if needed, in small sections.