The Best Heat Protectants for Hair (and Why You Should Never Skip One)

A heat protectant coats each strand in a lightweight polymer layer that redistributes heat evenly and slows moisture loss, so a straightener, curler or dryer smooths and shapes hair instead of cooking it. Skipping it doesn't just risk a bad hair day, it accelerates the kind of cumulative damage that shows up as dryness, split ends and dullness weeks later. Here's how heat protectants actually work, the temperature you should be styling at, and the best formulas to add to your routine.

What Does a Heat Protectant Actually Do?

A heat protectant works by coating the hair in a thin, even layer, usually built from silicones or polymers, that acts as a buffer between the tool and the hair itself. Heat styling tools can reach temperatures well over 200°C, hot enough to boil the water inside your hair shaft and cause it to bubble, crack and break from the inside out. This buffer slows heat transfer into the hair shaft and helps lock in moisture that would otherwise evaporate under direct heat, which is why hair styled without one tends to feel drier and look duller over time, even if it looks fine on any single day.

Most heat protectants also do double duty, adding slip so the tool glides through hair with less friction and mechanical stress, and many are formulated with oils or conditioning agents that leave hair smoother and shinier as a bonus.

What's the Right Temperature for Your Hair Type?

Higher heat doesn't style hair better, it just increases the risk of damage. Fine or colour-treated hair styles well at lower temperatures, generally under 180°C, since it's more porous and prone to heat damage. Thick, coarse or curly hair can usually tolerate higher heat, up to around 200°C, because it takes more energy to reshape.

Expert Tip: Astin, Hairhouse's Trichologist in Training, recommends starting at the lowest temperature that still gives you the result you want and only increasing it if needed. "It's easy to default to the highest setting because it styles faster," she says, "but the extra 20 or 30 degrees you don't need is doing damage without doing anything for your style."

What Are the Best Heat Protectants to Try?

House Bestseller: De Lorenzo Defence Extinguish

De Lorenzo's Defence Extinguish is an organic Argan Oil thermal spray and one of Hairhouse's top-selling heat protectants, recognised in Hairhouse's Pro Beauty Awards Hall of Fame. It's Australian-made, vegan, sulphate-free and paraben-free, and works by shielding hair from heat while nourishing it with Argan Oil at the same time, rather than just forming a barrier and leaving conditioning to a separate product.

Shop now: De Lorenzo Defence Extinguish 200ml

House Exclusive: Make Styling Heat Protect Spray

Make is an Australian-made, vegan brand available exclusively at Hairhouse, and its Styling Heat Protect Spray was named a Heat Protector Hero winner in Hairhouse's Pro Beauty Awards. It forms a protective barrier against heat damage while helping strengthen hair with hydrolysed proteins, and it's sulphate-free and paraben-free if you're after a cleaner formula.

Shop now: Make Styling Heat Protect Spray 250ml

Award-Winning Pick: evo Icon Welder Heat Protection Spray

Recognised as a Heat Protector Hero in Hairhouse's Pro Beauty Awards, evo's Icon Welder is enriched with Nettle Extract and Horsetail to protect hair from thermal styling while helping fight frizz. It's a good option if you want a heat protectant that also pulls double duty as an anti-frizz spray on humid days.

Shop now: evo Icon Welder Heat Protection Spray 200ml

Everyday Pick: ghd Bodyguard Heat Protect Spray

One of Hairhouse's bestselling heat protectants, ghd's Bodyguard spray is a lightweight, invisible layer you spritz through damp hair before styling. It's an easy, no-fuss option if you want reliable daily protection without an added scent or residue getting in the way of your usual styling products.

Shop now: ghd Bodyguard Heat Protect Spray 120ml

Premium Pick: Kérastase Chronologiste Thermique

For hair that gets styled with heat most days, Kérastase's Chronologiste Thermique is a heat-activated treatment that protects against damage from tools up to 230°C while working to regenerate hair over time. It's a step up from a standard spray, built for anyone treating heat protection as part of an ongoing hair health routine rather than a once-off styling step.

Shop now: Kérastase Chronologiste Thermique 150ml

Lightweight Pick: Moroccanoil Perfect Defence

A weightless, dry aerosol spray built around Moroccanoil's signature Argan Oil, Perfect Defence protects hair from heat without weighing it down or leaving it feeling coated. It's a good option for fine to medium hair that needs protection without the heavier finish some thermal sprays leave behind.

Shop now: Moroccanoil Perfect Defence 225ml

How Do You Use a Heat Protectant Properly?

• Apply to damp, towel-dried hair before blow-drying, and again before using a straightener or curler on dry hair, since heat protectants work best applied in the format the tool is being used on.
• Focus mid-lengths to ends, where hair is oldest and most prone to damage, rather than saturating the roots.
• Gently squeeze out excess water and reduce friction with a microfibre towel, like the Hairhouse Rapid Dry Turban Towel, instead of rubbing hair dry, which roughs up the cuticle before you've even reached for a hot tool.
• Detangle with a gentle brush, such as the Tangle Teezer Wet Detangler, before styling, since pulling a comb through knotted, heated hair adds mechanical stress on top of thermal stress.
• Let hair reach its full drying or styling temperature gradually rather than blasting the highest heat setting from the start, which gives the protectant time to do its job before hair is exposed to peak heat.

Frequently Asked Questions

Do I really need a heat protectant?

Yes, if you use any hot tool including straighteners, curlers or dryers. Heat protectants form a buffer that slows heat transfer into the hair shaft and helps prevent the moisture loss that leads to dryness, breakage and split ends over time.

Does heat protectant work on wet or dry hair?

Most formulas are designed to work on damp hair before blow-drying and can be reapplied to dry hair before straightening or curling. Check your specific product, since some sprays are formulated for one or the other rather than both.

What temperature should I style my hair at?

Fine or colour-treated hair generally styles well under 180°C, while thick, coarse or curly hair can usually handle up to around 200°C. Starting at the lowest effective temperature and increasing only if needed reduces unnecessary heat exposure.

Can a heat protectant replace a conditioner or treatment?

No. Heat protectants are designed specifically to buffer against thermal damage, not to replace the moisture and repair benefits of a proper conditioner or treatment. Most people need both as part of a complete routine.

How much heat protectant should I use?

This varies by formula and hair length, but a good guide is one to two spritzes or a coin-sized amount for shoulder-length hair, focusing on mid-lengths to ends. Using too little won't provide adequate coverage, while too much can leave hair feeling weighed down.

This guide is written and reviewed by Astin, Hairhouse's Trichologist in Training. Meet the experts behind our advice.

Ready to protect your hair from heat damage? Shop the full range of heat protectant sprays, serums and treatments in-store or online at one of Hairhouse's 100+ stores and salons across Australia.