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No matter what, I always have to use a heat protectant. I haven`t tried that many, but these two are my favorite.
They both seem to protect my hair exactly the same. They even disperse the same amount of product with each spray, which I really like. Each one has a distinct smell, but I find that the Tresemme one lasts on my hair for a little while. The CHI one smells like cologne, but you can`t smell it anymore once it`s on your hair. Also, The CHI 44 Iron Guard absorbs a lot faster into my hair than the Tresemme Heat Tamer Spray. Some people have said that the CHI 44 Iron Guard makes their hair feel weird, but that hasn`t happened to me :)
Overall, I like both of them equally. I only prefer the Tresemme one because it is $10 cheaper than the CHI one, and they both do the same thing and even perform exactly the same. But I kinda like the CHI bottle better haha. I recommend both, but if you`re on a budget I recommend that you get the Tresemme Heat Tamer Spray. (: