What does 4B hair need?

Heavy butters such as shea or mango over a water-based leave-in. Twist-outs, braid-outs, or coil-outs to create definition. Deep conditioning weekly with heat, plus regular protein treatments. Low-manipulation and protective styling to retain length.

What should 4B hair avoid?

Any dry manipulation — detangle only when wet and conditioned. Fine-tooth combs; use a wide-tooth comb or fingers. Lightweight products, which cannot hold moisture in 4B. Tight styles that pull at the hairline.

Type 4 · Coily

4B Hair

Sharp Z-shaped bends with little natural definition. Type 4B hair bends in sharp Z-shaped angles rather than coiling, giving it a cottony texture and little natural definition. Learn how to identify 4B hair and retain both moisture and length.

Build my 4B routine

Free · 2 minutes · No signup required

How do I know if I have 4B hair?

Your strands bend at sharp angles in a Z shape rather than curving into coils. The texture feels cottony and the hair has very little definition on its own, shrinking dramatically when dry.

Key characteristics of 4B hair

Sharp Z-shaped bends rather than rounded coils
Cottony, fluffy texture
Around 70% shrinkage from wet to dry
Very little natural curl definition
Fragile at every angle where the strand bends

The one thing 4B hair struggles with most

Fragility and definition. Every sharp Z-bend in a 4B strand is a weak point where breakage starts, and the same sharp angles are why 4B will not clump into visible curls without being set.

What 4B hair needs

Heavy butters such as shea or mango over a water-based leave-in
Twist-outs, braid-outs, or coil-outs to create definition
Deep conditioning weekly with heat, plus regular protein treatments
Low-manipulation and protective styling to retain length

What 4B hair should avoid

Any dry manipulation — detangle only when wet and conditioned
Fine-tooth combs; use a wide-tooth comb or fingers
Lightweight products, which cannot hold moisture in 4B
Tight styles that pull at the hairline

4B hair and porosity

4B hair is almost always high porosity because of how many raised cuticle points those sharp bends create. Heavy sealing butters are not optional for 4B — they are the core of the routine.

Take the free porosity test Check a product's ingredients

Get a routine built for 4B hair

Knowing your type is the first half. The quiz covers the other half — your porosity, scalp condition, damage level, and which ingredients your hair does not tolerate — then builds the routine around all of it.

Start the free quiz

Other coily hair types

4A Hair

Dense springy coils with a visible S-pattern

4C Hair

The tightest coil pattern with maximum shrinkage

Keep reading

All 12 hair types explained Hair type quiz Hair porosity test