Designer Collection Thermal Serum with Argan Oil, Alcohol-Free Conditioning Serum, Heat Protection and Shine, Frizz Eliminator, 4.2 oz

Works great for my hair. I read some comments about the smell. I actually like the smell, however it does go away once it's dry. Lightweight and doesn't leave my hair greasy. I have oily hair and I love this product!

The main reason why I decided to stick with this protectant was because I was impressed with the smell. It has a very light cucumber smell that disappears soon after applying. I really can't stand sweet, cocoa, vanilla, cupcake scents in hair products. I was so happy I found this product! The product works very well. I love the serum consistency. My hair has less breakage. Great product! That being said...I'm worried what the new signature scent will be be. I hope I don't have to go searching for another heat protectant.

Love this stuff been using for years always keeps frizz away and protects from over heating.

I purchased after observing my hair stylist use this on my hair before blow-drying. The results were fantastic - changed my texture - making hair shiny, flowing, and smooth. The price here was about 1/2 of what my salon was selling for and the 4.2 oz bottle will probably last me for a year as only a few drops are required for each application. Only down-side is the product has a slightly unpleasant odor, like cabbage, out of the bottle. However, it goes away after applying to hair and completing drying and styling. I plan to purchase again as this is best de-frizz, straighten, style serum product I have tried. Thanks, Rusk!

I purchased this to use on my hair for flat ironing. When I got it I smelled it and I did not like the smell and I immediately requested to return. Well, I washed my hair and the other 2 heat protectants I got just make my hair feel like straw so I said well let me just try the Rusk serum. WOW I LOVE IT. My hair feels SO SOFT. I LOVE IT. The scent goes away after using it with the heat. I am so happy I decided to give it a try. I canceled my request to return it. THIS IS A KEEPER.

If you have thick curly hard to straighten hair, this is the best! I apply after a towel dry, before I blow it dry, then flat iron Makes my hair super shiny, and silky straight. Use about a quarter size in my palm I have been using this for 15+ years. !

The RUSK Designer Collection Thermal Serum is a wonderful product that I can't live without when using my flat iron. Never disappointed in this product. However, when I opened the envelope and reached in for the bottle of RUSK, it was gooey all over. The bottle was barely closed and in fact not closed at all but I think that plastic tab that fits all the tops is what saved the day. After I washed the product off the bottle and held it up to the light to see how much product was left, I was surprised that only a small amount had leaked out of the bottle. I'm okay with this. Now with that behide me, I do want to say that I never have a bathroom cabinet empty of this product. It's excellent in every way and I do recommend it highly. I leaves my hair shiny and beautiful. What more could a girl want.

Ok so here goes. I have thin,curly, damaged hair. Basically the worst. It’s hard for me to want to use heat protectant when it makes my hair look dirty or oily. I’ve been shopping around trying different things, and as of 2-3 weeks I’ve been using this product. So it looks thick and like omg your hair is gonna be greasy but surprisingly it’s not !! I put very little (dime size amount) in my palms and spread it through my wet clean hair a couple times. Might be easy to put too much so start off w little then repeat process as needed. Smell is nice, somewhat familiar. It helps my hair look less damaged, helps keep my hair straight, gives my hair some weight, and my hair is growing!! Like I def see some growth prob from being so well protected! Def worth a try. UPDATE. 6months later and I’m still using this. My hair has def grown and is being protected from heat !! Def will be buying another bottle soon. UPDATE 2/25/22 Been using this since 10/10/20. Works well with other products without feeling greasy ! So you go girl and take care of that hair ! Literally putting this and like 4 other products in my hair including oils/ serums. Hair is shiny and longer than ever. Who knew putting time and effort in your hair would make it healthier and just better lol. Some of us gotta work for some things right! Worth it. UPDATE 03/30/23 Still using this after every shower. I try new products regularly but this one is always my last step !!

This is my 2nd bottle and I love this stuff!!

A really great product to use with hair straightener. Have never suffered from split ends using this product. Frizzy hair is soft and silky. Have been using it for a few years now, was unable to find it at my local hairdressing suppliers lately, never thought amazon would sell it, thank god they do. Having to pay twice the price is worth it.

Me gusto mucho, me quita el frizz y me da mucho brillo al cabello aparte que lo protege del calor

J'utilise ce produit depuis des années c'est très efficace avant de se servir d'un séchoir ou d'un fer à lisser les cheveux sont super doux et brillant on peut mettre ce sérum le matin sur cheveux secs et procéder à son brushing et ça c'est vraiment très pratique je le recommande à 100%

I've used the thermal serum for several years, because it gives the best protection against using heat on your hair. Other products leave my hair feeling dry or don't actually protect it from the heat. Only the smell of the thermal serum good be a little more attractive (though it isn't a bad smell, just neutral). Rusk is a little more expensive, but definitely worth the money!