Editor's TipEditor's Tip

To keep your hair free of product build-up, wash hair with Number 4’s Clarifying Shampoo.

Number 4 Hair Care

Birchbox Breakdown

Our Miami-based friends told us that this multitasking styling foam helps their hair look pristine through a summer’s worth of sweltering heat and tropical humidity. Naturally intrigued, we decided to investigate it for ourselves, and we’re pleased to report it works in all climates. The body-boosting formula provides flexible hold and can be used to define curls or fight frizz. Bonus: it also prevents heat and sun damage and extends the life of your color with loads of nourishing botanicals.

How it Works

Conditioning resin fights humidity and conditions strands to create volume and hold, while the foam’s Liquid Defense™ Complex—made from burdock root, oolong tea, Irish moss, and vegetable protein—hydrates and strengthens. Add fruit and plant botanicals like black currant, lemongrass, and gooseberry for shine, color protection, and gentle purification.

How to Use

Dispense a small amount of foam into hands and distribute through damp hair, starting at roots for added volume and working through to ends. Blow-dry or style as usual.

Water, Polyquaternium-68, PEG-40 Hydrogenated Castor Oil, Phenoxyethanol, Fragrance (Parfum), Ethylhexylglycerin, Decyl Glucoside, Cinnamidopropyltrimonium Chloride, Limonene, Butylphenyl Methylpropional, Linalool, Helianthus Annuus (Sunflower) Seed Oil, Alpha-Isomethyl Ionone, Citral, Hydroxyisohexyl 3-Cyclohexene Carboxaldehyde, Glycerin, Coumarin, Evernia Furfuracea (Treemoss) Extract, Sodium Ascorbyl Phosphate, Hydrolyzed Soy Protein, Macrocystis Pyrifera Extract, Ribes Nigrum (Black Currant) Leaf Extract, Yogurt Extract, Arctium Lappa Root Extract, Camellia Sinensis Leaf Extract, Chondrus Crispus (Carrageenan) Extract, Euterpe Oleracea Fruit Extract, Garcinia Mangostana Peel Extract, Hibiscus Sabdariffa Flower Extract, Ilex Paraguariensis Leaf Extract

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

Product Reviews & Sample Feedback

16 Reviews
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Most Helpful Customer Reviews

Great shine and volume

The first time I used Number 4 Styling foam I got several compliments on the shine and volume I had to my hair. I could tell as soon as I finished my blow out that this is a different product for me. I love the way my curls held for several days, having a touch up blow out each morning.

5
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One of my top products I have discovered from Birchbox!
Purchased

I use this product everyday. It has been a lifesaver for my fine straight hair. I apply it near the roots in the areas I want a little more volume before blowdrying. It really gives my hair volume and helps with styling, holding curl, etc. The smell is phenomenal too-I absolutely love it. The travel size I owned originally was less than 2 oz and lasted me about 3-4 months, so this full size bottle will last an extremely long time!

5
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Excellent in extreme humidity
Purchased

I read the birchbox description of this product, and I was optimistic but still skeptical. I travel frequently to Miami and Puerto Rico. I have fine hair, but it gets super frizzy with even mild humidity. Using this product with a blow dryer guarantees me a frizz proof day. Be careful not to use too much though or it looks like you have dandruff.

5
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On the fence...
Purchased

I have loved all the No. 4 products I've sampled in my boxes, so I thought I'd order this in hopes it would give my straight hair some oooomph. It sorta works - not as good as some other products I currently use. The pros are the glorious smell and how soft my hair is when I do use it. It does create a wee bit of volume but not enough for me to purchase again.

4
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Great hold
Purchased

This is a great styling foam. It has a soft, flexible hold with a very small amount of product used. And it has a great light fragrance.

5
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Great mousse
Purchased

This stuff is great for giving your hair a nice root life and body - just make sure to use it on damp or almost dry hair so it doesn't get to sticky or tacky. I prefer to use it on damp hair and comb it into place and let it air dry - you get natural body, texture and hold this way.

4
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Wonderful smell, very flexible.
Purchased

I had been using off the shelf mousse, which worked but gave me helmet hair. This styling foam leaves no residue and keeps my hair from turning into a dandelion all day long. Plus it smells SO good. Will definitely be buying again.

5
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Another Great Number 4 Product

I have just started using Number 4 hair products but had not tried this one. I have fine hair and a lot of products just weigh my hair done too much. This was not heavy at all and I liked how it worked on my hair. I would recommend this to anyone with fine hair.

5
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Great styling foam - no frizz!
Purchased

One of my biggest problems has been frizz. This has really worked to keep the frizz down and keep my air nice and shiny and thick looking. I have wavy hair and it helped hold my waves and give my hair shine and bounce. I am sold on the Number 4 brand. Love it!

5
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Can't live without
Purchased

This product was made for summer. If you don't live with humidity and or dry hair, please keep that to yourself! The mouse is not drying, and easy to distribute. My hair held its shape post blow dry in a humid beach environment. I liked the fact that my hair felt healthy and flexible and just looked good. I have repurchased it (don't want to run out), and was glad that a small travel size came in one of the sets. I will use this year round because the mouse just made my hair feel like hair should!

5
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