Number 4™ Thermal Styling Spray

While the hair of our dreams is glossy and sleek, our real hair leaves a lot to be desired. Whether your hair is fried and dull from too much heat styling or naturally frizzy, protect it with this nourishing spray. It’s packed with proteins and conditioners that hydrate and heal damage. An added bonus? It’s 100 percent vegan and free of gluten, sulfates, and parabens.

Number 4™ Thermal Styling Spray
3.9 out of 5 stars, based on 2,210 Reviews 2,210 Reviews
3.9 out of 5 stars
5 Star
703
4 Star
839
3 Star
463
2 Star
146
1 Star
59
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Thick
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17 & under
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It's ok
Sampled

After trying this product for a few days it just ok. I have very frizzy hair. I used this product continuously for a week. i didn't see much reduction in the amount of frizz after styling.

3
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Number 4™ Thermal Styling Spray
Sampled

I never heard of the Number4 product line until Birchbox, and I have loved it ever since! Their packaging is cute and clean, and their products always smell divine!

5
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Good product

This product was good. Made my hair feel nice. Would recommend.

4
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Not for me...
Sampled

I don't use this type product in my hair, but passed on to someone who will get some good use out of it. Never heard of the brand before birchbox.

2
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Finally, a No 4
Sampled

Really like this product. Although not my typical preferred scent (smells a bit woodsy), I really like how it soft it leaves my hair feeling and the smell is growing on me. =)

4
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Obsessed with Number 4
Sampled

Love their products & this one didn't let me down either... I've used it all & desperately needing to buy another bottle. I love it! Works great!

5
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Great

I used this product to give my hair curls but it worked great. I just wished it smelled better

5
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Good styling spray
Sampled

I used this product on wet hair. After blow drying, my hair did seem smoother and shinier. My waves from the curling iron also seemed to hold better.

1
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Great Product!

I style my hair almost everyday and I absolutely love this stuff. It makes my hair look amazing. I will likely buy this in a full size when I run out!

5
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Good protection, not so great hold
Sampled

This spray did seem to do a good job of keeping my hair from getting dried out and damaged from high-heat styling. Because it said "long-lasting hold" on the package, I was really hoping it would keep my flat-ironed hair straight for a night, but alas, the wave came back pretty quickly. I guess that part of it only works for keeping curls curly. Not a bad product, but looking for something that serves both purposes.

3
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