Editor's TipEditor's Tip

For best (ie: biggest) results, follow with Fleur de Temps Volumizing Condition, which adds both body and shine.

Number 4 Hair Care

Birchbox Breakdown

This singular shampoo takes inspiration from both Paris and Texas. Yes, you read that right. The gorgeous packaging and fresh scent are a nod to French style, while the scientific formula is designed to turn fine, meek strands into big, bodacious hair. You’re on your way to full, voluptuous strands.

How it Works

This sulfate-free formula is designed to detangle and cleanse hair without weighing it down. It uses natural lemongrass, golden seal, and gooseberry, plus the brand’s four signature Liquid Complexes™. Each complex is a different blend of natural ingredients designed to help protect, purify, strengthen, and revitalize hair.

How to Use

Emulsify in hands and massage into wet hair. Lather. Rinse. Follow with Fleurs de Temps Volumizing Condition.

More for You!
  • Free returns within 90 days of purchase
  • Extra samples and gifts in the Bonus Shop

Product Reviews & Sample Feedback

3,729 Reviews
3.8 out of 5 stars
5 Star
1168
4 Star
1298
3 Star
789
2 Star
239
1 Star
235
my profile
people who
purchased
sampled
Hair type
Curly
Dry
Fine
Frizzy
Kinky
Normal
Oily
Straight
Thick
Wavy
Hair color
Brown
Blonde
Black
White or gray
Red
Other
Age
17 & under
18-24
25-34
35-44
45-54
55 & over
Apply

Most Helpful Customer Reviews

Excellent!
Sampled

I loved this sample for my fine hair. I have not had good results from other No. 4 products but this one was great and I was pleasantly surprised!

5
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
I like this stuff
Sampled

My hair thanks me, that is for sure. I liked it a lot, brought out the curls and made it feel soft

5
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Not great
Sampled

I don't really like this product, as it weighs my hair down quite a bit. I think that the product might not be particularly suitable for those with thicker hair (like myself).

2
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Amazing!
SampledPurchased

I love this shampoo. I have fine, thinning hair and it really helped my hair look fuller. I have tried many volumizing shampoos, and this is by far the best!

5
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Great
Sampled

I loved the smell and texture of this product :-) I will be purchasing this product as soon as possible

4
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Great product!
Sampled

I really liked this product a lot! It smelled soo good and it made my hair more full looking and added a good amount of volume to it! I plan on buying this shampoo!

4
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Great product for fine hair
Sampled

I have fine thinning hair and this shampoo is great for volumizing. For me, it worked well alone or with the volumizing conditioner. I usually steer clear of conditioners and use a detangled or milk, and this is shampoo worked well like that as also.

5
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Not great
Sampled

It smelled nice, however it did nothing for my hair other than make it feel dry. I am really disappointed with this product.

1
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Not my favorite
Sampled

I didnt feel that this shampoo volumized my hair at all. It smelled good but I didnt like the end result.

3
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Best Shampoo
Sampled

By far the best shampoo I've ever used! Love the scent and how it makes my thick, dull hair fluffy and shiny! Great combined with the conditioner too.

5
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No