Baby-fine, straight hair is the epitome of the 1A category. This hair textures doesn't hold a curl well and can be difficult to style. Common complaints include oiliness and limp-looking strands. Keep dry shampoo on hand for an afternoon reboot, and avoid thick, heavy conditioners that can weigh hair down and make your hair look and feel a greasy.
Celebrity examples: Dakota Fanning, Gwyneth Paltrow
Product recommendations: Klorane Dry Shampoo (£8), Kérastase Carré Lissant Smoothing Sheets (£24)