Best Flat Iron Sprays – 2020 Complete Review

| Last Updated: April 23, 2020

Most girls love new hairstyles. Heating tools are essential parts of your beauty bag to either curl your hair, straighten it, or put it up. However, with excessive heat comes hair damage. For this reason, you need a good heat protectant for your hair.

When using a flat iron, the extreme heat can be damaging to your hair. Using a heat-protection spray can help to reduce the effects of high temperatures on your hair, protecting it from drying out and breaking. According to the style director at Pierre Michel Salon in New York, using a heat-protection spray is essential when using any form of heated hair styling equipment.

Finding a high-quality flat iron spray will create a barrier between your hair and the heat, protecting it from becoming brittle and keeping it moisturized.

Comparison Chart of the Best Flat Iron Sprays




HSI Professional Argan Oil Heat Protector

HSI PROFESSIONAL Argan Oil Heat Protector | Protect up to 450º F from Flat Irons & Hot Blow Dry | Sulfate Free, Prevents Damage & Breakage | Made in the USA | 8 Ounce, Packaging May Vary

Best Overall

Premium Nature Argan Oil Hair Protector Spray

Argan Oil Hair Protectant Spray - Thermal Heat Flat Iron Straightening Protectors For Styling Treatment Against Hot Blow Hair Dryer Natural Prevents Damage Dryness Breakage Split Ends Protection Spray


TRESemme Thermal Creations Heat Tamer Protective Spray

TRESemmé Thermal Creations Heat Protectant Spray for Hair 8 oz

CHI Silk Infusion

CHI Silk Infusion, 12 FL Oz

TRESemme Expert Selection Heat Protection Spray, Keratin Smooth

Heat Protectants vs. Flat Iron Sprays

Heat protectants and flat iron sprays are often thought of as interchangeable. However this is not the case. Heat protectants can be used to protect hair from various forms of heat treatment, including blow dryers and heated rollers. On the other hand, flat iron sprays more suitably applicable for use when direct high temperatures are applied to the hair, as with a flat iron.

Heat protection sprays, also referred to as thermal protectants, use a two-pronged method to protect the hair. The agents in the formulas provide a protective shield between the hair and the heating equipment while also conditioning the hair to retain moisture.

While there are many expensive and impressive scientifically-formulated heat protectants, many natural oils, such as grapeseed oil and argan oil, can also serve the same purpose. Flat iron sprays, however, tend to be infused with elements such as smoothness-enhancing keratin to achieve a sleek, flat look as well as protecting the hair.

Moreover, heat protectants need to be sprayed at a distance from the head to avoid leaving patches of moisture. But changes in the technology of flat irons has meant that many of these flat iron sprays are perfectly safe to use on wet hair.

While flat iron sprays are excellent for their particular tool, heat protectants tend to work well with a variety of different components. This makes them interchangeable with a variety of heated hair instruments and means they often provide somewhat better all-round protection.

Do Flat Iron Sprays Really Work? Why Should They Be Used?

Flat iron sprays work in a myriad of ways to protect the hair. Similarly to sunscreen, the silicone in the sprays provides a protective layer between your hair and the heat being applied to it.

Secondly, they condition the hair using a plethora of fatty acids and vitamins that are infused into the sprays. While conditioning the hair, these sprays also lock the moisture into the hair, keeping the hair from becoming brittle and breaking off or causing split ends.

While there is a misunderstanding that oils will cause your hair to sizzle, this only refers to very heavy oils like coconut oil. Light oils such as grapeseed and avocado oil will 'dry' in the hair and will protect it rather than sizzling.

The reason you need to take steps to protect your hair with flat iron spray is that when such high heats are applied to the hair, the hair strands dry out. This causes the moisture to evaporate from the inside of the hair while simultaneously burning the outer cuticle. This will cause the hair to thin out, break off or become frizzy. Flat iron sprays provide the physical barrier and conditioning tools to prevent this from happening.

Review of the Best Flat Iron Sprays

Choosing the best flat iron spray for your hair is subjective. However, here are some pointers on a few of the most highly-recommended sprays available today.

HSI PROFESSIONAL Argan Oil Heat Protector | Protect up to 450º F from Flat Irons & Hot Blow Dry | Sulfate Free, Prevents Damage & Breakage | Made in the USA | 8 Ounce, Packaging May Vary


  • It also works as a leave-in conditioner
  • This spray contains no sulfates, molecules known the dry out the hair
  • Great to use with flat irons, it protects hair at temperatures up to 450 F
  • Not only is it safe for regular hair, it can also be used to protect hair extensions
  • The argan oil in this product nourishes the hair by deeply penetrating each strand and locking in moisture for a smooth, glossy finish


  • Some users have noticed that this product is a little heavy-handed for fine hair and can leave it feeling stiff and straw-like
  • This protector does not always work to secure down the lighter, flyaway hairs, meaning you may need to use a hair spray as well

A highly-recommended product, this thermal-protecting heat spray is salon-grade. An all-round heat protector, this can be used with blow dryers, curling rollers, and curlers, as well as flat irons.

It can be used by hair salons and hair professionals as it is specifically designed to give salon-like results and support a variety of hairstyles. It has effective and premium ingredients that provide sleek and shiny hair within no time. This heating mist, when applied to the hair before any hairstyling, leaves the hair weightless and free from any damage. 

Argan Oil Hair Protectant Spray - Thermal Heat Flat Iron Straightening Protectors For Styling Treatment Against Hot Blow Hair Dryer Natural Prevents Damage Dryness Breakage Split Ends Protection Spray


  • The argan oil soaks into the hair, moisturizing it.
  • Unlike other natural oil-based products, it does not leave the hair oily.
  • The product can also moisturize the scalp to help protect the follicles and roots.
  • This heat protectant also protects from humidity, making it great for people with curly or frizzy hair.
  • This product contains no sulfates, parabens, or other drying chemicals that can lead to drier hair in the long run.


  • Also, it claims to be all-natural yet the scent is far stronger than most natural products, which makes it seem like perfume is added.
  • Some customers have complained that the formula of this product has changed very recently, leaving it much more watery than before and far less effective.

Argan Oil Hair Protector Spray is a heat-protection spray that uses all-natural products and is not tested on animals. Both a heat-protector and a detangler, the conditioning elements mean it can also be used as a leave-in conditioner.

TRESemmé Thermal Creations Heat Protectant Spray for Hair 8 oz


  • You only need a couple of sprays on the head so it is extremely good value.
  • It leaves neither an oily finish or a sticky feel, and it leaves the hair soft and natural looking.
  • The bottle design makes this product easy to use and the high levels of dimethicone give a silky, shiny finish after just one use.


  • While this spray is designed to be a hair-styling spray, sometimes it seems not to hold your style particularly well. 
  • Customers have also complained that while the spray bottle design is easy to use, the handle breaks off very easily.

This non-aerosol heat protection spray is extremely powerful and is designed to protect the hair while also giving it an overall shiny appearance after just a singular use. It doubles as a hair spray to hold style in place.

CHI Silk Infusion, 12 FL Oz


  • This also locks the moisture inside and protects the hair from external damaging factors everyday life.
  • The product does not contain alcohol, which can further dry the hair, and doesn't leave any build-up of residue in the hair.
  • The wheat and soy proteins also moisturize the hair to give a shiny look and to prevent brittleness from heat damage.
  • The silk proteins in this product smooth the cuticles, giving the hair a softer finish while rejuvenating any previous heat damage.


  • There are complaints that it’s now far less effective.
  • Also, it has quite an unusual smell which can be off-putting.
  • There have been recent changes to the formula of this product which have left it thinner and more watery.

CHI Silk Infusion is a leave-in treatment which has silk infused in it. It aims to reconstruct the hair by infusing the strands with natural proteins while also protecting from further heat damage. This product is cruelty-free as it has not been tested on animals.


  • This product contains biotin which encourages hair growth.
  • It contains no alcohol which dries the hair and encourages hair loss.
  • It has a very inviting smell and does not leave build up of residue in the hair.
  • This product seems to cover all of the five benefits it claims to achieve, keeping hair protected while also taming it and giving it a smooth, silky feel.


  • There are some complaints that it feels heavy on the hair and can make the scalp itch.
  • Some customers have complained that it does not work well with extremely frizzy or thick hair.
  • The handle has the same problem as the other Tresemme product we’ve reviewed - it is fragile and breaks easily.

This product is infused with keratin and marula oil to work as a moisturizing hair care product as well as a heat protection spray. It aims to tackle five issues: taming frizz, detangling hair, boosting shine, protecting against heat, and taming static hairs.

How to Use a Flat Iron Spray

For best results when using a flat iron spray, apply it to damp hair and let the hair air dry. When the hair is dry, the ingredients have had time to soak into the hair for maximum protection.

If you apply a flat iron straight after using a heat-protection spray, the dampness from the spray can cause the hair to sizzle.

If you have not washed your hair and would like to use a flat iron, you can spray the hair with a protection spray from 6-8 inches away. Not only will this stop wet spots on the hair, it will also evenly distribute the spray across the hair. It is still best to wait a few minutes for this to set and dry.

Do not apply too much; 4-5 sprays over your whole head is enough. Otherwise it will leave the hair feeling oily. As you want to make sure you have applied it evenly, it may be best to section your hair, pinning it up with bobby pins or crocodile clips, and to comb it through from roots to ends so that every section of the hair is protected.


Protecting your hair from heat damage will help to keep it looking luscious and healthy. Heat protection sprays and serums can provide that protection while penetrating the hair with varying vitamins, proteins, and nourishing components.

While protection sprays like this work wonders to help prevent heat damage, try to make sure you limit the use of high-temperature instruments such as flat irons, as continuous use will always do a little damage, no matter the precautions you take.

Hi I'm Emilia! I like to think of myself as the "crash-test-dummy" of the hair world. Whether that means testing out the newest curling iron or going with fresh hair styles. I like to mix it up. I share my thoughts on Caffe Hair based on my first hand experience!