How does this shampoo differ from a regular shampoo for dry or coloured hair?

Most shampoos for dry or coloured hair focus on either gentle cleansing or surface conditioning. BISOU Glossy does both in one step: its mild surfactant base removes sebum, dust and styling residue without stripping the skin's natural hydrolipidic film, while conditioning agents deposit on the lifted cuticle, smooth it down and reduce friction between strands. This dual action is what creates the immediate gloss — light reflects evenly off a flattened cuticle instead of scattering. The formula is designed specifically for hair that has lost moisture and lipids through colouring, bleaching, perming or frequent heat styling, where the cuticle stays raised and hair feels rough. If your scalp is normal but the lengths are dry, this shampoo targets that mismatch without over-cleansing the roots.