The type of wavy hair that curls up in a U shape is typically referred to as "type 2" hair, specifically 2B or 2C. Type 2 hair is characterized by loose waves that can form an S or U shape pattern.
- Type 2B: This type has a bit more frizz and waves that are well-defined, forming a slight U shape.
- Type 2C: This type is thicker and tends to have more volume and can show a more pronounced U shape with some tighter waves.
If you're looking for hair products or styling techniques, focusing on moisture and anti-frizz properties can help maintain that U shape while keeping the hair healthy and styled.