What the term means.
These labels belong to the strongly curled family. A tight return changes tip projection and clearance. The actual base and curve matter more than assuming a universal position on a curl-strength ladder.
The terms share this definition because their catalogue meanings overlap. This is not a claim that every DD and U product matches. D+ is another supplier-dependent name that needs checking against the actual product before a substitution.
The technical details.
- Profile
- Very strong rounded return
- Lower section
- Strongly rounded, supplier-dependent lower geometry
- Tip and bend
- Pronounced return towards the upper curve
- Comparison
- Some brands call U a DD curl; others distinguish them.
These are industry definitions. Product names, profiles and availability vary; your artist selects the actual system and construction for your appointment.
A common question.
Can DD, U and D+ be exchanged automatically?
No. Compare the brand's lower attachment section, curve and tip direction. Similar labels are not proof of identical fit or projection.
Put the meaning into context
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