For anyone who wants a leave-in step that adds strength and softness and protects against heat styling. Mon Platin's distributors list it for all hair types, including curly, straight, fine, dry, colour-treated and keratin-treated hair. It suits daily at-home use, especially before blow-drying or flat-ironing.

A rinse-out mask does its work in a few minutes and then goes down the drain. One Secret stays on the hair, so the hyaluronic acid complex keeps conditioning while also acting as a buffer against styling heat and city grime. It is a good fit if you heat-style often and want one leave-in to handle softness, detangling and protection.

• Wash and towel-dry hair.
• Spray onto clean, damp hair, focusing on mid-lengths and ends.
• Comb through to distribute evenly.
• Do not rinse. Blow-dry or style as usual.
• Use daily or after every wash.

Pros

• No rinsing, so it fits easily into a daily routine
• Doubles as a heat protectant before blow-drying or straightening
• Spray nozzle makes it easy to distribute through damp hair
• Listed for all hair types, including colour- and keratin-treated hair

Cons

• No specific heat-protection temperature is stated by the brand
• Daily use means a 250 ml bottle goes faster than a weekly mask
• No official full ingredient list published