It’s incredible how much our hair can affect our mood and confidence. As Phoebe Waller-Bridge perfectly put it in Fleabag: “Hair is everything. We wish it wasn’t so we could think about something else sometimes. But it is. It’s the difference between a good day and a bad day.”

I relate to this so much that I do everything possible to keep my hair on the “good day” side. I deep condition, use scalp oil, and detangle wet hair with a wide-tooth comb. But despite hearing how crucial cold air is for setting a blowout, I always skipped that step—until I tried the new Dyson Supersonic Hair Dryer.

This dryer is lighter and faster than ever, making it a dream for someone as hair-obsessed as me. Best of all, the cool air button is impossible to miss and effortless to use—just a quick tap activates it. Now, I’m hooked.

Once I started using the cool shot, I discovered its magic. Not only does it lock in my style (even through sweaty Zumba sessions), but it also offers benefits I never realized.

### Why Cold Air Matters
After my Dyson revelation, I asked stylist Maria Roberts why cool air is a must. The biggest perk? It prevents heat damage by sealing the cuticle, reducing breakage and frizz.

Even though Dyson’s dryer is designed to minimize heat exposure, Roberts says the cool shot still helps. “It’s about the optical effect—blowing cold air downward smooths the cuticle,” she explains. That’s why releasing curls while they’re still warm ruins them; the cool shot “freezes” the style in place.

### Frizz Fighter
A quick blast of cold air doesn’t just set your style—it adds shine and tames frizz, especially for fine or delicate hair. Roberts, who works in humid Ibiza, says her salon always finishes blowouts with cool air at the roots to prevent frizz around the crown. It’s also perfect for smoothing flyaways in updos.

### How to Use It
Now that we know the cool shot is essential, here’s how to use it right: Section your hair or apply it all over, focusing on the roots. Just a few seconds of cool air is all it takes for smoother, longer-lasting results.