What is a key characteristic of dry hair?

Dry hair is primarily characterized by a lack of moisture and elasticity. This condition can manifest as hair that feels rough to the touch, looks dull, and is prone to breakage and split ends. Moisture is essential for maintaining hair's flexibility, so when hair lacks this moisture, it becomes brittle and loses its natural shine and smoothness. Elasticity is also crucial for the hair's ability to stretch and withstand tension without breaking; therefore, dry hair tends to be less resilient and more susceptible to damage.

In contrast, options describing hair as shiny and smooth, thick and full, or oily at the roots represent different hair conditions that indicate hydration, volume, or excess oil rather than dryness.