Editor's TipEditor's Tip

For ultra-healthy locks, apply Super Comb Prep & Protect after deep conditioning with Number 4 Lumiere d'hiver Reconstructing Masque.

Number 4 Hair Care

Birchbox Breakdown

As self-confessed blow dryer addicts, we put our hair through a lot of stress. To keep our strands from a styling-induced meltdown, we’ve been using this extra hydrating leave-in conditioning mist. It doesn’t just protect hair from heat damage; it also doubles as a color protector and UV shield. The sulfate-free formula sinks in quickly and has a pretty floral scent thanks to white freesia, amber, and musk.

How it Works

Natural conditioners—including black currant, soy yogurt, algae, and yerba mate—combine to restore hydration to dry hair, while the unique UV/Color Polar Shield protects dyed or sun-exposed locks. Soy and vegetable proteins repair damage caused by heat and chemical styling. And don’t forget about the defrizzing factor—anti-static technology tames flyaways, making hair more manageable and easy to style.

How to Use

After shampooing, wring excess moisture from hair and towel dry. Holding the spray bottle upright, spritz product evenly. Using a wide-toothed comb or your fingers, gently work the product through hair from root to tip. Style as usual.

eau/water, amodimethicone, peg-40 hydrogenated castor oil, cetrimonium chloride, glucose, panthenol, parfum/fragrance, cetrimonium carboxydecyl peg-8 dimethicone, sodium pca, citric acid, cinnamidopropyltrimonium chloride, trideceth-12, magnesium sulfate, hydroxyethylcellulose, trisodium ethylenediamine disuccinate, hydrolyzed soy protein, hydrolyzed vegetable protein pg-propyl silanetriol, glycerin, sodium ascorbyl phosphate, lactoperoxidase, glucose oxidase, macrocystis pyrifera extract, ribes grossularia fruit extract, ribes nigrum (black currant) leaf extract, chondrus crispus (carrageenan) extract, euterpe oleracea fruit extract, garcinia mangostana peel extract, helianthus annuus (sunflower) seed oil*, arctium lappa root extract*, avena sativa (oat) kernel extract*, camellia sinensis leaf extract, cymbopogon schoenanthus extract, hibiscus sabdariffa flower extract*, hydrastis canadensis (golden seal) root extract*, ilex paraguariensis leaf extract*
*certified organic by QCS

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

Product Reviews & Sample Feedback

19,911 Reviews
4.0 out of 5 stars
5 Star
7577
4 Star
7161
3 Star
3638
2 Star
1057
1 Star
478
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

Nice Product
Sampled

Does exactly what it says it will do. Nice scent and my hair felt very good after blow drying. Would recommend.

4
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Good conditioner
Sampled

It is also a good leave in conditioner- I ran out of conditioner and used this instead- worked great! I use heat on my hair every day, so I'll have to use it a little longer to see if it really helps as a heat product. Smells good

4
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Magic spray
Sampled

I've never saw such fast result. Just a few sprays and my hair went from tangled and unmanageable to silky smooth and easy to brush. Cutting my hair routine in half.

5
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Perfect for thick dry hair
SampledPurchased

Loved the sample so much that I purchased a bottle. This will definitely be a staple for me. I find it's lightweight and it makes my hair shiny and sleek.

5
Was this review helpful to you? Yes | No 0 of 1 found this review helpful. Was this review helpful to you? Yes | No
LOVE IT
Sampled

I have enjoyed using this leave-in, it has given my hair a lot of body and is not like most that make your hair oily.

5
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Leaves hair without snarls and with MAJOR shine!
SampledPurchased

I don't wash my hair more than every third day. When I don't use a shampoo and conditioner, I often use a simple ecologically friendly shampoo. After towel drying, I spritz my hair about five times with this fabulous product. It instantly eliminates any snarled strands of hair, making combing ridiculously easy. And possibly even better, after drying my hair naturally (I never use a hairdryer) it leaves a to-die-for glossy finish that lasts for days! I have thin, fine, short hair and can attest that this wonderful product does not weigh down my hair in the least. Bouncy, shiny, glorious hair is what I have every time I use this, making it tops on my list of hair are products!

5
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Love this product!
Sampled

This spray not only keeps my fly-always in check, but it smells amazing! I've already ordered the full sized bottle to include in my daily styling regiment. It's already bringing moisture and life back to my fried hair.

5
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Fairly good - not a good smell
Sampled

This product does what is says...it is a nice leave in conditioner that does not leave my hair oily, greasy or gel-like. The one negative is the sent. It is NOT a floral...and it's not at all what I want my hair to smell of. If they can enhance the smell, this would be a home run.

3
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
I'm on my second full size
Sampled

Got a sample of this with my Birchbox and have been using it ever since. Seven sprays on the back of my hair keeps it straight, tangle free, smooth but not greasy. Love it!

5
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
I love Nuber 4
SampledPurchased

I am so impressed with this product I will keep ordering it when I run out. I lost hair in clumps because of a hospital visit and along with my other leave in's including It's a 10, that I have been using for a year now. After you blow dry your hair , it is so smooth and glossy . I found a new favorite leave in!!!

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