
- Human hair
- Restricted substances
Our science
We don’t make the hair and hope it performs. Testing is part of how we make it.
Every production batch is tested by an independent laboratory, blind, on samples taken from the production run. If one tested strand fails our specifications, the entire batch is discarded at our expense. It never ships.
That means finding a problem is supposed to be our problem before the hair ever becomes yours.
Quality shouldn’t be left to chance or opinion. The properties that can be measured should be measured against defined standards. So we use independent testing to tell us exactly what we’re making and whether it meets the requirements we set.
We test. We measure. We adjust. We discard what doesn’t pass.Not the strand. The entire batch.
The testing system
Before it reaches your chair, the hair answers three questions through ten tests.
Open a question



The last word
No batch ships until Whitney and Jonathan approve it.
Every batch carries a number that ties it to its records.
Whitney SexsmithJonathan Sexsmith
Under the microscope
Two fibers, side by side at 600× magnification. Look closely at the surface.
600×Magnification, both fibers, under a scanning electron microscope.

From independent ASTM and ISO testing. Prolonged Hair at Level 12 against a leading competitor at Level 9.
Independent ASTM / ISO studies
These four results show what the strand withstands, how far it stretches, how well it holds its shape and how much less it breaks.
What it means at the chair
Visibly denser, healthier strands, even after high-lift processing to Level 12.
Controlled manufacturing, measured by an independent laboratory, so the hair performs the way the records say it does.
Measured strength and stretch. Cuticle-intact hair you can bleach, tone and style like your own. Donor-consent letters, purchase records, and batch serialization on file.
Exclusively for licensed stylists
By the time a stylist puts her reputation behind our hair, we should already know what we’re putting ours behind.