Based on this structure, hair types fall into four texture-based categories: straight, wavy, curly, and kinky. Dr. Dominic Burg, trichologist and chief scientist for évolis Professional, explains that within each group, hair is then defined even more specifically according to three types of density: "It's based on quite a simple classification that looks at the strand quality and shape—are your strands thin/fine, medium or coarse," he says. "Hair that falls into the curly and wavy types tend to be classified according to the coil shape and tightness more than the hair shaft thickness."
These over-simplified categories come in handy when determining how to treat and style your mane. “We categorize your hair to understand how to care for it best,” says Dianna Cohen, the founder and CEO of new haircare start-up Crown Affair. “Treating your Type 2 hair with made-for Type 4 products could leave it over-moisturized and weighed down, while a Type 4 gal borrowing a regime from a Type 3 friend could make her hair feel dry and brittle without the proper moisture.”
It’s definitely not an exact science—hair changes as we do, and is often affected by dynamic factors such as age, environment, and physical health. It’s also all about perspective: “One expert may categorize your waves as 2A while another might say 2B, so it may take a bit of trial-and-error to discover your ideal number and regime,” Cohen says. “The end goal here is to have a connection with your hair, while also perfecting your routine, so your hair is both uniquely you and wildly healthy.”
You certainly don't need a pro to identify your hair type. Cohen recommends washing your hair and letting it air dry naturally with no products or treatments. Then, cross-check the end result with the 12 categories below.
The 12 Different Hair Types
Type 1: Straight
The first type of hair is one of the easiest to identify, but still contains a wide range of textures. Type 1’s sub-categories are defined mainly on how easily the hair holds a curl (largely from the texture of each strand).
1A: Fine and silky, 1A hair dries straight and usually struggles to hold a curl.
1B: This type of hair has a fuller natural volume and may curl up at the ends, but has no “real” waves.
1C: This hair is mostly straight with a few waves hiding out. 1C holds curls exceptionally well, but is prone to frizz.
Pro Tip: “If your hair is straighter, brushing will be the cornerstone of your routine. Daily brushing helps keep your hair healthy and clean, so go take a few minutes every morning or night to brush it all out,” says Cohen.
Type 2: Wavy
Type 2 hair isn’t exactly straight, but also not exactly curly. It dries somewhere in between and, depending on its density, can have more or less S-shaped curls throughout.
2A: Hair is fine and silky, but dries with a little more volume or loose wave.
2B: That classic, beachy look with a medium-texture and a little bit more frizz. These waves thrive with a hands-off approach.
2C: This type of wavy hair is the thickest and may have a few curls scattered here and there; 2C hair benefits from finger styling and a little extra moisture.
Pro Tip: “Wavy types can benefit from volume and moisture, so look for products that provide a balance of these elements," says Dr. Burg.
Type 3: Curly
Calling all curly girls. This hair ranges from light ringlets to big spirals and, given its shape and texture, tends to be the most delicate when it comes to frizz, product overuse, and heat damage.
3A: These are the largest curls and are often mixed in with some waves. Because 3A is on the finer side, it’s relatively easy to style and blow out, which means it requires a little extra TLC when it comes to heat.
3B: These tighter curls can range in size and hold their shape when pulled out (unlike 3A); 3B hair is a bit more coarse, which means it’s usually full and susceptible to frizz.
3C: 3C curls are thick, pronounced, corkscrew curls that usually begin to grow out and away from the roots before cascading down.
Pro Tip: “With improper care, the natural fall of the hair shafts is disrupted, so it’s best not to fight curly hair but help it find its shape," says Dr. Burg. "Curly hair is best styled with fingers, rather than brushes when damp or wet. Leave in conditioners, hair masks, and subtle use of styling products when the hair is damp will allow the curls to naturally find their shape, while maintaining shine and preventing frizz."
Type 4: Kinky
Finally, Type 4 hair is coiled, full of texture, and is also the most common hair type found in Black women. Given its structure, it's usually prone to dryness and loves some serious hydration.
4A: These are tightly coiled curls that grow out and away from the roots. Since they’re smaller, they tend to retain moisture a bit better but can still be thirsty.
4B: Type 4B hair isn’t S-shaped like other curls and instead zigs and zags in different directions. It’s also usually more frizzy, and benefits from an oil or other frizz-control product.
4C: This hair is dense with high volume. It’s kinky and tightly-wound with no definitive curl pattern and, like other Type 4s, benefits from heat protection and hydration.
Pro Tip: “Type 4 hair is all about hydration and moisture, says Cohen who recommends working conditioner through hair with a wide-tooth comb and finishing with a hair oil on the ends to hold moisture. You can also use hair oil to un-do twists in order to help reduce frizz, she says.
Again, finding your hair type and building your respective routine might take some experimenting. Hair, like everything else, is extremely personalized, and you have to find what works for you. Use these categories as a guide to healthy, happy tendrils, but the more you explore and familiarize yourself with your own hair, the better your results will be.
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