Concealer guide

Hair fibers: the 10 second fix, done right.

How they work, how to pick a shade that nobody can tell, and the seven step method that survives wind, sweat and a hat.

What they are

Thousands of tiny keratin hairs that cling to yours.

Hair fibers are keratin, the same protein as your hair, cut to the thickness of a real strand and given a static charge. Shake them over a thin area and they grab onto the hair you have, so each strand looks 3 to 4 times thicker and the scalp stops showing through.

They need some hair to cling to. On completely bald skin they just sit there. For thinning, they are the fastest fix that exists.

10secto cover a thin crown60 to 90applications per 27.5 g bottle9shades, swap free within 30 days

Shade finder

Match the roots, not the ends.

Tap the color closest to your hair at the roots. When in doubt, go one shade darker.

Step by step

01
Dry, styled hair first

Fibers do not stick to wet hair. If you use minoxidil, apply it first and let it dry fully (20 to 30 minutes).
02
Hold 3 to 4 inches above

Shake gently over the thin spot. Short shakes, not one big dump.
03
Build in light layers

Two or three passes look like hair. One heavy pass looks like a patch.
04
Pat, do not rub

Press lightly with your fingertips to settle the fibers between the hairs.
05
Feather the edges

A tiny amount just past the thin area so there is no hard line.
06
Lock it in

A light mist of normal hairspray from 10 inches away. This is what makes them survive wind, sweat and a hat.
07
Wipe strays

A dry tissue on the forehead and neck. Done.

Real questions

Do they stay on? With hairspray, yes: a workday, a workout, light rain, a hat. Heavy rain or a swim washes them out.
Do they rub off on pillows? Not if you spray. Without spray, a little dust on a light pillowcase.
Do they block minoxidil? No. Minoxidil goes on first, dries, then fibers. They wash out every night with shampoo.
Can people tell? From a foot away, no. In photos, no. Up close in bright light with too much product, yes. Use less.
Harmful? They sit on the hair shaft, not in the follicle. No clogging, no damage.

Mistakes

Too muchDark, matte, patchy. Brush some out, go lighter.

Wrong shadeMatch the roots. Darker beats lighter.

Wet hairWait until fully dry.

No hairsprayThe spray is the difference between all day and an hour.

Hard edgesFeather past the thin spot.

Good to know: fibers hide thinning, they do not fix it. The best setup is fibers for today and minoxidil for the next six months. Most people need less and less fiber as regrowth comes in.