Which hair type is least likely to be damaged by heat styling?

Coarse hair is least likely to be damaged by heat styling because its larger diameter and denser cuticle layers make it more resilient to high temperatures. Coarse hair tends to be more robust and can withstand heat without suffering damage as easily as finer hair types. Additionally, the structure of coarse hair often allows for better moisture retention, which helps to protect it from becoming overly dry or brittle when exposed to heat.

In contrast, fine hair has a smaller diameter and a more delicate cuticle layer, making it much more susceptible to heat damage. Straight hair can also be fine or coarse, but fine straight hair is particularly vulnerable. Curly hair, while sometimes also coarse, can display unique challenges with heat styling due to its shape and the potential for heat to disrupt its natural curl pattern, even if it is often thicker in texture. Hence, coarse hair's innate qualities provide greater protection against heat styling damage compared to other hair types.