For anyone who regularly blow-dries or flat-irons colored, damaged or chemically straightened hair and wants a heat-activated treatment built into that routine, rather than a separate rinse-out step. It works across fine, medium and coarse hair, and is aimed specifically at hair exposed to frequent heat styling.

Regular heat styling is one of the main causes of ongoing hair damage, and Thermo Builder is formulated to work with that heat rather than just protect against it: the silk protein and oil complex is designed to build and coat the hair shaft as it's blow-dried or flat-ironed, so the styling step itself contributes to repair instead of only adding wear. That's a different approach from a standard heat protectant, which mainly shields hair rather than actively restoring it.

• After shampooing, dispense the cream into your hands and emulsify between your palms.
• Apply to damp hair, starting at the lower and top sections before working through the front.
• Style as usual with a blow dryer or flat iron; the heat activates the treatment as hair dries or is straightened.
• Alternatively, apply after shampooing and leave in for two to three minutes before rinsing if not heat styling immediately.

Pros:

• Heat-activated formula turns the blow-dry or flat-iron step into part of the repair process instead of pure heat exposure
• Silk protein and argan/sea buckthorn oils target both strength and hydration in one leave-in step
• Works for both blow-drying and flat-ironing, so it fits into either styling routine

Cons:

• Only delivers its full benefit when followed by heat styling; it's not designed as a plain leave-in for air-dried hair
• As a leave-in cream, it needs to be measured carefully on fine hair to avoid weighing it down