Hair Types Decoded: The Complete Guide from Type 1A to 4C

The hair-care aisle is a maze. Half the products say "for curly hair" and half say "for all types," and neither tells you which one your specific hair will respond to. The Andre Walker system — created by Oprah's longtime stylist in the 1990s — is the framework that quietly fixed this. Once you know your type, you stop guessing.

This guide covers the four main types and their twelve subtypes, what defines each, and what care strategy works.

Why hair typing matters

Hair has three independent properties:

1. Type — the curl pattern (straight, wavy, curly, coily)
2. Density — how many strands you have per square inch
3. Porosity — how easily moisture enters and leaves each strand

Type is what most products are designed around. Density tells you how much product you need. Porosity tells you which formulas work.

Most "I have curly hair but products for curly hair don't work" frustration comes from missing one of the other two variables. Solve all three and your routine collapses into something simple.

Type 1: Straight Hair

No curl pattern. The strand falls smoothly from root to tip. Often shiny because oil from the scalp travels easily down a straight strand.

1A — Pin-straight, fine

The flattest, finest hair type. Reflective and smooth, but very prone to oiliness. Volume is hard to keep.

Care strategy: Lightweight shampoos. Avoid heavy conditioners and oils — they weigh hair down within hours. Volumizing products and root sprays are your friends. Wash more often than other types if your scalp produces oil quickly.

1B — Medium straight

Straight with slight body. Holds curls from a curling iron for a few hours. Most common straight hair worldwide.

Care strategy: Mid-weight conditioners. Texturizing sprays add bend. Heat damage shows up faster on this type than thicker hair, so heat protectant matters.

1C — Coarse straight

Thick, often shiny, hard to bend. Common in many East Asian populations.

Care strategy: Rich conditioners and oils. Doesn't get weighed down easily. Curling irons need higher heat (430°F+) to hold a shape, but use heat protectant — coarse doesn't mean indestructible.

Type 2: Wavy Hair

A loose S-shaped pattern. Sits between straight and curly. The most under-served hair type by major brands — most "curly" products are too heavy and most "straight" products too light.

2A — Loose waves

Hair forms a gentle S only at the bottom half. Easily straightened or curled.

Care strategy: Lightweight mousse to define waves. Skip cream-based curl products — they flatten the wave. A diffuser on low heat preserves the natural shape.

2B — Defined waves

Clearer S-pattern from mid-shaft down. Hair is wavier when wet, frizzier when dry.

Care strategy: Light leave-in conditioner. The "scrunch and air-dry" method works beautifully. Avoid towels — use a microfiber or a cotton t-shirt to absorb water without disrupting the pattern.

2C — Coarse waves with curls

Strong S-curves with the occasional spiral. The transition zone between wavy and curly. High frizz tendency.

Care strategy: Curly Girl Method works for many 2Cs. Sulfate-free shampoo (or co-wash), creamy leave-in, finger-coiling for definition. Diffuse on cool air.

Type 3: Curly Hair

A clear, coiling pattern. Curl forms even when wet. Texture ranges from loose ringlets to tight corkscrews.

3A — Loose curls

Curls roughly the diameter of sidewalk chalk. Hair shines, has bounce, defines easily.

Care strategy: Lightweight to medium curl creams. Avoid heavy butters — they flatten 3A's natural bounce. Refresh days 2–3 with water and a touch of leave-in.

3B — Springy ringlets

Curls roughly the diameter of a Sharpie marker. More volume, more frizz potential.

Care strategy: Curl creams with stronger hold. Plopping (wrapping wet hair in a microfiber or t-shirt while it air-dries) preserves curl shape. Sleep on silk to reduce overnight frizz.

3C — Tight corkscrews

Curls roughly the diameter of a pencil. High density, high volume, prone to dryness because oil can't travel down a tightly coiled strand.

Care strategy: Rich conditioner, leave-in, then a curl cream or gel — the LCO method (liquid, cream, oil) works well. Detangle only when wet and saturated with conditioner.

Type 4: Coily / Kinky Hair

Tight zigzag or coil patterns. The most prone to dryness because the spiral structure of the hair shaft makes oil distribution difficult. Highly textured but also highly fragile if mishandled.

4A — Defined coils

Tight S-pattern, roughly the diameter of a crochet needle. Coils visible when wet and dry.

Care strategy: Heavy leave-ins and butters. The LOC method (liquid, oil, cream) seals in moisture. Protective styles between wash days reduce manipulation damage.

4B — Z-pattern

Sharp angular bends rather than smooth curves. Coils don't form complete circles. Can shrink up to 70% of its length when dry.

Care strategy: Dense moisturizers. Shea butter, castor oil. Detangle in sections with conditioner. Stretching techniques (banding, twist-outs) preserve length without heat.

4C — Tightest coil

Very tight zigzag with little to no defined curl pattern. Most fragile of all hair types. Can have stunning volume but requires the most care.

Care strategy: Maximum moisture. Deep conditioning weekly. Low manipulation, protective styles. Always detangle wet, never dry. Avoid rubber bands, tight elastics, sulfate shampoos — anything that breaks already-fragile strands.

Beyond Andre Walker

The system has critics. Some say it under-serves type 4 by lumping it together; others note it doesn't account for porosity or density. Two alternatives:

• LOIS system — categorizes by curl shape (L, O, I, S) and texture (thin, medium, coarse).
• FIA system — combines curl pattern, density, and width.

If Andre Walker doesn't fit your hair, look at LOIS. It often clicks for type 4 hair specifically.

Porosity test (do this once)

Drop a strand of clean hair in a glass of water. Watch for 3 minutes:

• Floats — low porosity. Cuticle is tight. Products sit on top — needs warmth or steam to absorb.
• Sinks slowly — normal porosity. The lucky case.
• Sinks fast — high porosity. Cuticle is open and damaged. Hair takes in water fast and loses it fast — needs heavy sealants and protein.

Porosity changes a routine more than type does. If your hair is type 3B but high porosity, oils and butters are essentials. If it's 3B low porosity, those same products will sit on top and weigh hair down.

What hair type doesn't tell you

Hair type isn't a permission slip or a constraint. The same product can work on a type 2A and a type 3B if both have low porosity. The "ideal routine" doesn't come from your type alone — it comes from type plus porosity plus density plus what your scalp produces.

Start with type as your map, then layer porosity and density on top. The first time the routine clicks, you'll feel it.