Which hair type is most prone to frizz?

Curly hair is most prone to frizz due to its natural structure and texture. The shape of curly hair creates a surface that can trap moisture, which leads to the cuticle layer lifting and allowing humidity to penetrate. This causes the hair strands to swell, resulting in a frizzy appearance. Curly hair's inherent tendency to be drier, along with its unique geometry, makes it more susceptible to external moisture and environmental factors that exacerbate frizz.

In contrast, straight hair generally lies flat, allowing it to reflect light better and stay smoother in humid conditions, while wavy hair has an intermediate texture that can also resist frizz to some extent. Fine hair can experience frizz, but it is often more affected by oil buildup or environmental stressors rather than its structural configuration. Hence, curly hair’s specific curling pattern and susceptibility to moisture make it the hair type that is most likely to exhibit frizz.