Hair Fibers

Thin spots covered without the months of waiting of regular hair treatments. Your scalp stays hidden, 24H+.

Covers thin spots

Instant fuller hair

24H+ hold

Scalp friendly

100% natural

Washes out easily

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“I've tried dozens of brands before, now I only use Smooth Labs, all my clients love it.”

Jeremy Walter, Barber & Hair consultant

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Used every day by 100,000+ members

  • "I love it, it keeps my hair soft and hydrated 10 out of 10"

  • "Great products, I use them every morning"

  • "I love Smooth Labs, they make the best products."

  • "The only products that work on my hair"

  • "Regular shampoos destroy my hair, this one is different"

  • "Nothing to say, the products are very high quality"

Is this product made for me?

If you can see your scalp and you hate it, this is the one.

  • Thinning areas and thin spots

  • A receding hairline or a crown that shows

  • Black or very dark hair

Get an even finish with the Applicator. Lock it all in with Fiber Fixator.

How is it different from regular hair treatments?

Regular treatments ask you to wait months and hope.

Fibers work right now. Shake them over your thin spots and they cling to the hair you already have, until you can't see your scalp anymore. Nobody knows it's there.

  • Instant. You see it the moment you shake it on.

  • Scalp friendly. It sits on your hair.

  • 24H+ hold. It stays put.

  • Gone when you want. Wash it out with shampoo.

Ingredients

5 ingredients. 100% natural.

Keratin

The fibers that cling to your hair

Sodium Bicarbonate

Keeps the fibers loose

Silica

Keeps the fibers separate

Biotin

Hair care vitamin

Iron Oxides

The black color

Keratin, Sodium Bicarbonate, Silica, Biotin, Iron Oxides (CI 77491, CI 77492, CI 77499)

For external use only. Avoid contact with eyes. If contact occurs, rinse immediately with water. Stop using if irritation or redness occurs. Keep out of reach of children. Store in a cool, dry place. Do not inhale the fibers.

How to use

Shake on. Pat down. Done.

  1. Start with dry, clean hair.

  2. Shake the fibers gently over your thinning areas until you can't see your scalp.

  3. Pat your hair lightly to set the fibers.

  4. Spray Fiber Fixator to lock them in. Wash out with shampoo.

Frequently asked questions

4.8

/5

by

4204

reviews

What real customers say

79%

5 star reviews

98%

Recommend

82%

Buy again

Verified customer

Scott R.

my roommate hasn't said a word

I'm 23 and my crown started showing about 2 years ago, I hated every photo taken from above. been using these for a few weeks and my roommate, who roasts me for literally everything, hasn't said a word. it just looks like I have more hair. that's all I wanted

Verified customer

Jack T.

5-a-side in the rain, still fine

Played 5-a-side in the rain on Thursday and fully expected black lines running down my forehead after. Nothing. Fibers then the Fiber Lock Spray on top, that's my routine now. Still looked normal at the bar after the match

Verified customer

Eric K.

she ran her hands through my hair

First date in a year where I didn't panic when she touched my hair. Nothing on her fingers, she just said my hair felt thick lol. I'd been avoiding that moment for so long

Verified customer

Enzo C.

2 minutes before the bus

thought it'd be a whole process every morning. it's shake, pat, spray, done. I do it before the bus and I've never been late because of it (I'm late for other reasons)

Verified customer

Cole P.

read the ingredients before putting it on

I read the back of anything before it goes on my scalp. Keratin, sodium bicarbonate, silica, biotin and iron oxides for the colour. That's it, 5 things. No itching, no redness, and it washes out with my normal shampoo

Verified customer

Elliot D.

windy day by the lake, didn't move

Went for a walk along the lake in Geneva on one of those days where the wind comes from everywhere. My hair got messy but no scalp showing, the fibers stayed put. I lock them with the spray every morning

Verified customer

Kieran M.

actually black

I have black hair and the cheap fibers I bought online had this brownish tint under the light. these are actually black and blend right in

Verified customer

Corentin B.

get the whole set

Bought the fibers, the Fiber Applicator, the Fiber Hairline Card and the Fiber Lock Spray together. Felt like a lot at first but each one has a job: applicator for my crown, card for the front, spray to lock it all. The fibers I had before were a shaker and good luck

Verified customer

Joe P.

towel was clean after leg day

leg day, sweating like crazy, wiped my face with my towel and checked. towel clean, hair still full. fibers + Fiber Lock Spray before the gym

Verified customer

James B.

works on my beard too

bought it for my crown but tried it on the patchy spot on my cheek with the card. beard looks full and the line is sharp. 2 problems sorted with one bottle

Verified customer

Jérôme D.

passed the club toilet mirror test

my worst nightmare was those lights right above your head in club toilets, where your scalp shines through. went out saturday and checked at 2am lol. still no scalp. the fibers grab onto the hair you already have so it just looks thick, not like powder sitting on your head

Verified customer

Mark D.

white pillow still white

biggest fear was waking up with black marks on my white pillow, or worse on hers 😅 didn't happen. I put them on in the morning, they're still there at night, and they come out in the shower the next day

Verified customer

Matteo M.

22 with a receding hairline

22 and my temples started going back, which at uni feels like the end of the world. these + the Fiber Hairline Card and my front looks normal again. like a fresh cut, not drawn on

Verified customer

Finn D.

just give me a bigger bottle

4 stars only because I want a bottle twice this size. been using it every day since September and it looks like my own hair. take this as a 5

Verified customer

Lukas L.

the photo from above

my mate took a group photo from the balcony, from above. normally that's the one I'd beg him to delete. in this one I actually look like I have a full head of hair. it's my profile pic now

Verified customer

Dominic H.

my best mate found the bottle

-1 star because my best mate found the bottle in my bathroom, I had to tell him, and now he uses it too so it goes twice as fast lol. that's how good it is

Verified customer

Nick R.

3 weeks before my brother's wedding

No way I was waiting months for something to maybe work with my brother's wedding 3 weeks away. Shook them on, crown covered in about a minute. In the photos you'd never know

Verified customer

Côme R.

annoyed I didn't find this sooner

only 4 because I'm annoyed I spent 3 years wearing a cap in every photo when this existed. the product itself is perfect

Verified customer

Anatole T.

ordered because of the 30 days

Honestly the 30 day refund is the only reason I ordered, I was sure it would look fake on me. Never sent it back. On my second bottle

Verified customer

Joris A.

4 is my 5

I give 4 to everything, my mum says I'm impossible to please lol. this is the closest to a 5 I've ever written. full crown in a minute and no scalp in any photo since

Verified customer

Scott R.

my roommate hasn't said a word

I'm 23 and my crown started showing about 2 years ago, I hated every photo taken from above. been using these for a few weeks and my roommate, who roasts me for literally everything, hasn't said a word. it just looks like I have more hair. that's all I wanted

Verified customer

Eric K.

she ran her hands through my hair

First date in a year where I didn't panic when she touched my hair. Nothing on her fingers, she just said my hair felt thick lol. I'd been avoiding that moment for so long

Verified customer

Cole P.

read the ingredients before putting it on

I read the back of anything before it goes on my scalp. Keratin, sodium bicarbonate, silica, biotin and iron oxides for the colour. That's it, 5 things. No itching, no redness, and it washes out with my normal shampoo

Verified customer

Kieran M.

actually black

I have black hair and the cheap fibers I bought online had this brownish tint under the light. these are actually black and blend right in

Verified customer

Joe P.

towel was clean after leg day

leg day, sweating like crazy, wiped my face with my towel and checked. towel clean, hair still full. fibers + Fiber Lock Spray before the gym

Verified customer

Jérôme D.

passed the club toilet mirror test

my worst nightmare was those lights right above your head in club toilets, where your scalp shines through. went out saturday and checked at 2am lol. still no scalp. the fibers grab onto the hair you already have so it just looks thick, not like powder sitting on your head

Verified customer

Matteo M.

22 with a receding hairline

22 and my temples started going back, which at uni feels like the end of the world. these + the Fiber Hairline Card and my front looks normal again. like a fresh cut, not drawn on

Verified customer

Lukas L.

the photo from above

my mate took a group photo from the balcony, from above. normally that's the one I'd beg him to delete. in this one I actually look like I have a full head of hair. it's my profile pic now

Verified customer

Nick R.

3 weeks before my brother's wedding

No way I was waiting months for something to maybe work with my brother's wedding 3 weeks away. Shook them on, crown covered in about a minute. In the photos you'd never know

Verified customer

Anatole T.

ordered because of the 30 days

Honestly the 30 day refund is the only reason I ordered, I was sure it would look fake on me. Never sent it back. On my second bottle

Verified customer

Jack T.

5-a-side in the rain, still fine

Played 5-a-side in the rain on Thursday and fully expected black lines running down my forehead after. Nothing. Fibers then the Fiber Lock Spray on top, that's my routine now. Still looked normal at the bar after the match

Verified customer

Enzo C.

2 minutes before the bus

thought it'd be a whole process every morning. it's shake, pat, spray, done. I do it before the bus and I've never been late because of it (I'm late for other reasons)

Verified customer

Elliot D.

windy day by the lake, didn't move

Went for a walk along the lake in Geneva on one of those days where the wind comes from everywhere. My hair got messy but no scalp showing, the fibers stayed put. I lock them with the spray every morning

Verified customer

Corentin B.

get the whole set

Bought the fibers, the Fiber Applicator, the Fiber Hairline Card and the Fiber Lock Spray together. Felt like a lot at first but each one has a job: applicator for my crown, card for the front, spray to lock it all. The fibers I had before were a shaker and good luck

Verified customer

James B.

works on my beard too

bought it for my crown but tried it on the patchy spot on my cheek with the card. beard looks full and the line is sharp. 2 problems sorted with one bottle

Verified customer

Mark D.

white pillow still white

biggest fear was waking up with black marks on my white pillow, or worse on hers 😅 didn't happen. I put them on in the morning, they're still there at night, and they come out in the shower the next day

Verified customer

Finn D.

just give me a bigger bottle

4 stars only because I want a bottle twice this size. been using it every day since September and it looks like my own hair. take this as a 5

Verified customer

Dominic H.

my best mate found the bottle

-1 star because my best mate found the bottle in my bathroom, I had to tell him, and now he uses it too so it goes twice as fast lol. that's how good it is

Verified customer

Côme R.

annoyed I didn't find this sooner

only 4 because I'm annoyed I spent 3 years wearing a cap in every photo when this existed. the product itself is perfect

Verified customer

Joris A.

4 is my 5

I give 4 to everything, my mum says I'm impossible to please lol. this is the closest to a 5 I've ever written. full crown in a minute and no scalp in any photo since

And 4204+ more reviews

Frequently asked questions

Will people be able to tell?

No.

The fibers cling to your own hair and hide your scalp. Keep going until your scalp is no longer visible, then stop.

Will it fall out during the day?

24H+ hold.

For longer-lasting results, lock it in with Fiber Fixator.

Is it bad for my hair or scalp?

No. It's scalp friendly.

It sits on your hair and leaves when you shampoo.

Can I use it on wet hair?

No.

Dry, clean hair only.

How do I get it out?

Shampoo.

That's all it takes.

Do I need the Applicator?

You don't need it, but it makes it easier.

You get a more even, precise application than shaking by hand.

Do I need Fiber Fixator?

For longer-lasting results, yes.

One layer of spray locks the fibers in place.

What color is it?

Black.

Made for black or very dark hair.

Can I use it on my beard?

Yes. Use it with the Card to get clean, straight lines.

What if it doesn't work for me?

Then it costs you nothing.

You get 30 days to try it. Don't love it? Full refund, no questions asked.

Will people be able to tell?

No.

The fibers cling to your own hair and hide your scalp. Keep going until your scalp is no longer visible, then stop.

Is it bad for my hair or scalp?

No. It's scalp friendly.

It sits on your hair and leaves when you shampoo.

How do I get it out?

Shampoo.

That's all it takes.

Do I need Fiber Fixator?

For longer-lasting results, yes.

One layer of spray locks the fibers in place.

Can I use it on my beard?

Yes. Use it with the Card to get clean, straight lines.

Will it fall out during the day?

24H+ hold.

For longer-lasting results, lock it in with Fiber Fixator.

Can I use it on wet hair?

No.

Dry, clean hair only.

Do I need the Applicator?

You don't need it, but it makes it easier.

You get a more even, precise application than shaking by hand.

What color is it?

Black.

Made for black or very dark hair.

What if it doesn't work for me?

Then it costs you nothing.

You get 30 days to try it. Don't love it? Full refund, no questions asked.

4.6 TrustScore

2146 reviews

4.5 Stars

512 reviews

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