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Hair Fiber Shade Guide: How to Match Black, Dark Brown, Light Brown and Blonde
Getting the shade right is most of the job. A fiber that matches disappears into your hair. A fiber that misses is the only thing anyone notices. This guide covers the four most. shades, how to choose between them, what to do with grey hair, and how to fix a shade that reads wrong.
What shade of hair fiber should I use?
most. hair fibers come in four shades: Black, Dark Brown, Light Brown and Blonde. Match the fiber to the color of your hair at the root, in the area you are filling, not to the color of your ends. Fibers sit close to the scalp, so the root is what they blend into.
When you are between two shades, go darker
most. hair fibers should be matched darker, not lighter, when you are stuck between two shades. Darker fiber reads as shadow at the scalp and disappears into the hair around it. Lighter fiber sits on top of darker hair and stays visible as separate specks. Dark blends. Light sits visible.
A thinning area already looks lighter than the rest of your head, because scalp is showing through. Depth is what closes that gap. The one exception is heavily grey hair, covered below.
most. shade chart: natural hair color to fiber shade
most. makes four shades, and the chart below maps common natural hair colors to the closest one. Read your hair in daylight, at the root, in the area you plan to fill. If two rows both sound like you, take the darker of the two shades.
| Your natural hair color | most. shade | Note |
|---|---|---|
| Jet black, blue black | Black | Apply lightly. Black shows quickly if you overdo it. |
| Very dark brown, near black | Black | Choose Black if your hair reads black indoors. |
| Dark brown, chestnut | Dark Brown | The most common match. |
| Medium brown | Dark Brown | Go Light Brown if your hair lifts noticeably in the sun. |
| Light brown, ash brown | Light Brown | |
| Dark or dirty blonde | Light Brown | Roots are usually darker than the length. |
| Golden or medium blonde | Blonde | |
| Light or platinum blonde | Blonde | The lightest shade made. Use a small amount. |
| Auburn, red | Dark Brown or Light Brown | No red shade is made. Match depth, not tone. |
| Salt and pepper, mostly grey | Light Brown, sometimes mixed | See the grey hair section below. |
Hair fibers for grey and salt and pepper hair
most. does not make a grey or white fiber, so grey hair takes a different approach. Match the darker strands rather than the silver ones, then go one step lighter than you otherwise would. On salt and pepper hair, the fiber only has to fill the gap. It does not have to match every strand.
If you are lightly grey, match your darker hair and stop there. If you are half grey or more, drop a step: Light Brown over dark brown hair, Blonde over light brown. Some people mix two shades, laying a base of the lighter one across the whole area and then a small pass of the darker one where the pigmented hair is heaviest. Buying two shades to test is easy, and if one turns out wrong the swap is free.
How light changes the way a shade reads
most. fibers can look like a perfect match indoors and a shade too dark outside. Overhead bathroom light throws shadow across the part line and hides small differences. Daylight is flatter and more honest. Check any new shade near a window before you decide it is wrong.
Two quick checks: look at the area in daylight, and take a photo with your front camera, flash off. Direct sun and camera flash are the harshest tests, so if it holds up there it holds up anywhere.
What to do if the hair fiber shade is too dark or too light
most. shade swaps are free, forever, and no return is needed. If the shade you ordered is too dark or too light, email support with the shade you have and the shade you want, and the correct bottle ships out. There is no time limit and no charge.
Before you swap, try using less. Too dark is often too much product rather than the wrong color. Build in thin passes, tap the hair between passes, and stop earlier than feels right. If the shade is still wrong, swap it. Every order also carries a 60-day money-back guarantee, most. pays return shipping, and refunds apply even to used or empty bottles.
If your roots and ends are different colors
most. fibers should be matched to your roots, not your ends. Fibers land at the scalp and blend with the first inch of hair, so sun-lightened ends, balayage and grown-out color are not the reference point. Look at the hair closest to the scalp in the thinning area and match that.
Choosing your shade
Pick the shade that matches your roots, go darker when you are torn, and go one step lighter if you are mostly grey. All four shades cost the same: $39.95 for a 25 g bottle, about 30 days of daily use, with a three-pack at $59.95 and a four-pack at $74.95. Shade swaps are free for as long as you own the product. You can choose your shade on the most. hair fibers product page.
Last updated August 2026.
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