noun
hair type; hair quality
Refers to the inherent characteristics of one's hair, such as thickness, texture, curl pattern, or overall condition.
髪質に合ったシャンプーを選ぶことが大切です。
It's important to choose a shampoo that suits your hair type.
彼女は髪質が細くて、ボリュームが出にくい。
Her hair is fine, so it's hard to get volume.