Porosity
How easily your hair takes in and holds moisture. Low porosity resists water; high porosity drinks it up and lets it go quickly.
a little glossary
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Sister sizes
Bra sizes with the same cup volume on a different band. Go up a band, down a cup — and vice versa.
Undertone
The subtle hue under your skin's surface — warm, cool, neutral or olive. It doesn't change with a tan.
Dehydrated vs. dry
Dry skin makes less oil; dehydrated skin lacks water. Any skin type can be dehydrated.
Density
How many strands grow on your head — different from how thick each strand is.
Contrast
The difference between your hair, skin and eye depth. Useful when playing with color combos.