What is a characteristic of coarse hair?

Coarse hair is characterized by having a thicker diameter compared to finer hair textures. This thickness means that each individual hair strand is larger in circumference, providing the hair with a more robust structure. Coarse hair often feels stiffer and can be more challenging to manage compared to finer hair types. The presence of a thicker diameter affects various styling and treatment techniques, as coarse hair may require different products and approaches to achieve desired results, such as moisture retention and smoothness.

While the other characteristics might apply to different hair textures, they do not define coarse hair specifically. For example, coarse hair can be porous, but this is not inherently true for all coarse hair types. Similarly, coarse hair does not dry particularly quickly; rather, it can sometimes retain moisture longer due to its thickness. Therefore, the defining aspect of coarse hair is its thickness, as highlighted in the correct answer.