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Bumble and Bumble Hairdresser’s Invisible Oil Heat Protectant Leave In Conditioner Primer
Bumble and Bumble shared product-specific details for the Hairdresser’s Invisible Oil Primer: they repeatedly exposed treated vs untreated hair trusses to a 450°F flat iron, then evaluated damage differences against the control. I included it to show that higher-end brands do use similar truss-based, controlled heat exposure methods—even if they don’t always volunteer details publicly.
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Pros
- +Brand described a controlled truss test with treated vs untreated hair
- +Testing described at 450°F
Cons
- -They requested clarification on which product, suggesting methods may vary by product type
