Redken positions One United for all hair types and textures, from fine and straight to curly and coily, and it is suitable for colour-treated hair. It suits anyone who wants one leave-in to handle detangling, conditioning, smoothing, shine and heat protection instead of several separate products. The 150 ml size is handy to try or to carry; the 400 ml is the better value for daily use.

One United earns its name by folding a whole shelf of steps into one leave-in: its cationic complex conditions and detangles, Keracare (xylose) helps protect against heat, and coconut oil helps protect the hair fibre. You get smoother, shinier, easier-to-manage hair and help against breakage from a quick spray after washing, and it plays well with whatever else is in your routine.

Use One United with your other haircare and styling products:

1. Alone: spray on after cleansing, or on dry hair to refresh between washes.
2. With a rinse-out treatment: apply after cleansing and before the rinse-out treatment.
3. With a leave-in treatment: layer it after cleansing.

Pros

• Detangles, conditions, smooths and adds shine in a single spray.
• Includes heat protection, so it doubles as a pre-styling step.
• Lightweight, silky feel; safe for colour-treated hair.
• Can be used alone or layered with rinse-out and leave-in treatments.

Cons

• Coconut oil and silicones can feel heavy on very fine hair if you overspray; keep it to mid-lengths and ends.
• A light leave-in, not an intensive repair treatment for heavily damaged hair.