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!
  • Product orders $50+ and all monthly box brands ship free
  • Free returns within 90 days of purchase
  • Extra samples and gifts in the Bonus Shop

Product Reviews & Sample Feedback

5.0 out of 5 stars, based on 4 reviews 4 Reviews
5.0 out of 5 stars
5 Star
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Hair type
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White or gray
17 & under
55 & over

Most Helpful Customer Reviews

Perfect product

This product smells great. It makes my hair smooth but not weighed down. It brings out the natural texture in my hair too. It just makes my hair look super healthy which I love. Another great product from no4.

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How NOT to curl short hair

I have very short hair mostly because I don't want to bother with the hair all over me in a mess that would embarrass me, so about twenty years ago after I stopped dancing in the ballet, I cut off my bun and put it away to give to Cancer patients but my brother threw it out not knowing what it was, which is a pretty good example of what it looked like when I didn't do a French twist or French braids in various fun creative ways like many I see today. Had I had this extraordinary No. 4 Styling Foam I would have kept my hair because I still miss not having that part of my femininity! But alas probably some rodent made it into their home, keeping them warm in the winter and safe from the hard blowing winds we get in Louisville. I LOVE this stuff and am growing out my bangs so I can have a chic asymmetrical hairdo soon.

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This foam was absolutely amazing stuff! After I wash and condition my hair I just work a little of this foam in and that's it. I confess to being a bit lazy, I am one of those that go to bed with my hair wet. But this foam is just made for people like me. When I wake up, my hair is curly, smooth and shiny. Just gorgeous, you would think I worked really hard on it instead of slept on it. Just love it!

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I have very fine, thin hair and I'm constantly looking for new ways to earn volume and add life to my hair!! This is the best I have yet to find! It's also very lightweight and leaves your hair feeling healthy! No greasy feeling either!! It's a just try!!!

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