What the term means.
Curl letters are supplier naming conventions rather than universal angle measurements. Two C curls can differ in base length and bend position. Names such as C+, D+ or extreme-L need to be checked against that brand's actual profile.
Rounded C and D profiles differ from straight-base L, LC and LD profiles. The latter change where the lift begins rather than simply adding another step on a single strength scale. Compare base shape, curvature and length together before interpreting a curl code.
The technical details.
- Base
- The lower section available for attachment
- Bend
- Where the fibre starts to change direction
- Projection
- The visible tip position with the eye open
- Naming limit
- No universal degree value for every curl letter
These are industry definitions. Product names, profiles and availability vary; your artist selects the actual system and construction for your appointment.
Compare the curl profiles.
These drawings illustrate the general shape only. They are not calibrated measurements or a substitute for a supplier’s product diagram. Exact bases and curves vary between brands.
| Curl | Illustrative profile | Shape cue |
|---|---|---|
| B curl | Soft rounded lift | |
| C curl | Rounded mid-profile | |
| CC curl | Enhanced rounded curl | |
| D curl | Strong rounded curl | |
| DD / U curl | Very strong rounded return | |
| I curl | Almost straight | |
| J curl | Subtle tip lift | |
| L curl | Straight base, angled lift | |
| L+ curl | Straight base, fuller upper lift | |
| LC curl | Straight base, C-like upper curve | |
| LD curl | Straight base, D-like upper curve | |
| M curl | Lifted directional transition | |
| V curl | Speciality directional lift |
DD and U share one entry because some brands use them as equivalents. C+, D+, extreme-L and other speciality codes remain supplier-dependent; check the actual geometry before assuming a match.
A common question.
Is D curl the same as a 3D or 5D fan?
D curl describes shape. The D after a fan count means dimension: 3D has three extension fibres in that fan. A fan can have a separately specified curl.
Put the meaning into context
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