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HeatBounce conditioning heat protectant 8oz
K18 leave-in conditioner bottle with promotional text on a colorful background. Powered by patented resilicore™ tech
Before and after comparison of a woman's hair with K18 HeatBounce product.
Before and after comparison of a woman using K18 hair product, with a bottle of K18 HeatBounce product in the foreground.
HeatBounce heat protectant with pink hair illustration and text on a gradient background
Woman with styled hair holding a bottle of K-8 hair product, with text about heat protection and breakage reduction.
Person with long hair using a pink comb against a pink background with text "detangles even the most damaged hair".
K18REPAIR and HeatBounce products with colorful background
Four women using a hair styling tool with text indicating different heat styling tools.
K18 HeatBounce hair product and oil on a pink and yellow background with text comparing their features.
K18 hair care products with ressilicore heat-shielding technology on a pink background
Two K18 HeatBounce hair care products on a colorful background
Three women with styled hair against a colorful background with text about heat protection + conditioning for healthy, vibrant, shiny hair
HeatBounce conditioning heat protectant 8oz
K18 leave-in conditioner bottle with promotional text on a colorful background. Powered by patented resilicore™ tech
HeatBounce conditioning heat protectant 8oz
Before and after comparison of a woman's hair with K18 HeatBounce product.
Before and after comparison of a woman using K18 hair product, with a bottle of K18 HeatBounce product in the foreground.
HeatBounce heat protectant with pink hair illustration and text on a gradient background
Woman with styled hair holding a bottle of K-8 hair product, with text about heat protection and breakage reduction.
Person with long hair using a pink comb against a pink background with text "detangles even the most damaged hair".
K18REPAIR and HeatBounce products with colorful background
Four women using a hair styling tool with text indicating different heat styling tools.
K18 HeatBounce hair product and oil on a pink and yellow background with text comparing their features.
K18 hair care products with ressilicore heat-shielding technology on a pink background
Two K18 HeatBounce hair care products on a colorful background
Three women with styled hair against a colorful background with text about heat protection + conditioning for healthy, vibrant, shiny hair
4.8
Rated 4.8 out of 5 stars
547 Reviews
bestseller

HeatBounce conditioning heat protectant

The Future of Heat Protection

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description

The future of heat protection. This leave-in conditioning heat protectant detangles, softens, and delivers deeper heat protection than ever before*—for 85% less breakage after blow drying*.


*k18hairpro.com/disclaimers

    • More to know

      Resilicore™ heat-shielding technology is inspired by proteins in nature that can withstand extreme temperatures. Unlike traditional heat protectants that only coat the cuticle, the size + molecular makeup of resilicore™ allows it to penetrate deeper than ever before*, into hair's inner cortex where heat damage can occur, forming a protective shield that fortifies from within.

      Conditioning blend conditions, softens, and detangles even damaged hair.

      Created for all hair types + textures. Can be used on extensions.

      *k18hairpro.com/disclaimers

    • Key benefits

      Protects from heat up to 450°F 85% less breakage after blow drying* Lightweight formula conditions, softens and detangles even damaged hair

      *k18hairpro.com/disclaimers

    • How to use

      Apply throughout sectioned hair, brushing through to help with even distribution. Less is more. Start small and build as needed. Hair should feel soft and tangle-free, but not coated. Use on towel-dried hair before blow drying and on dry hair before hot tools.

    • Ingredients

      Water (Aqua) (Eau), Cellulose Gum, Isopentyldiol, Propanediol , Cetearyl Alcohol, Isopropyl palmitate, Sodium Benzoate, C13-15 alkane, sh-Oligopeptide-78 s-Fruit Fly Oligopeptide-1, (sh-Oligopeptide-78 s-Fruit Fly Oligopeptide-1) Peptides, Laurdimonium Hydroxypropyl Hydrolyzed Barley Protein, Helianthus Annus (Sunflower) Seed Oil , Oryza Sativa (Rice) Bran Extract, Helianthus Annuus (Sunflower) Extract, Rosmarinus Officinalis (Rosemary) Leaf Extract, Tocopherol, Behentrimonium Chloride, Brassicatrimonium Chloride, Gluconolactone, Arginine, Coco-Glucoside, Lactic Acid, Cellulose, C12-20 Alkyl Glucoside, Citric acid , Potassium Sorbate, Benzyl Alcohol, Isopropyl Alcohol, C14-22 Alcohols, Fragrance (Parfum), Amyl Salicylate, Benzyl Salicylate, Citronellol, Citrus Aurantium Peel Oil, Dimethyl Phenethyl Acetate, Geraniol, Geranyl Acetate, Isoeugenyl Acetate, Limonene, Linalool, Linalyl Acetate, Pinene, Tetramethyl Acetyloctahydronaphthalenes, Vanillin.

pairs well with
professional molecular repair mask
View Product
Astrolift reparative volume spray benefits
AstroLift™ reparative volume spray
View Product
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HeatBounce conditioning heat protectant 8oz
K18 leave-in conditioner bottle with promotional text on a colorful background. Powered by patented resilicore™ tech
Before and after comparison of a woman's hair with K18 HeatBounce product.
Before and after comparison of a woman using K18 hair product, with a bottle of K18 HeatBounce product in the foreground.
HeatBounce heat protectant with pink hair illustration and text on a gradient background
Woman with styled hair holding a bottle of K-8 hair product, with text about heat protection and breakage reduction.
Person with long hair using a pink comb against a pink background with text
K18REPAIR and HeatBounce products with colorful background
Four women using a hair styling tool with text indicating different heat styling tools.
K18 HeatBounce hair product and oil on a pink and yellow background with text comparing their features.
K18 hair care products with ressilicore heat-shielding technology on a pink background
Two K18 HeatBounce hair care products on a colorful background
Three women with styled hair against a colorful background with text about heat protection + conditioning for healthy, vibrant, shiny hair
HeatBounce conditioning heat protectant 8oz
K18 leave-in conditioner bottle with promotional text on a colorful background. Powered by patented resilicore™ tech
Before and after comparison of a woman's hair with K18 HeatBounce product.
Before and after comparison of a woman using K18 hair product, with a bottle of K18 HeatBounce product in the foreground.
HeatBounce heat protectant with pink hair illustration and text on a gradient background
Woman with styled hair holding a bottle of K-8 hair product, with text about heat protection and breakage reduction.
Person with long hair using a pink comb against a pink background with text "detangles even the most damaged hair".
K18REPAIR and HeatBounce products with colorful background
Four women using a hair styling tool with text indicating different heat styling tools.
K18 HeatBounce hair product and oil on a pink and yellow background with text comparing their features.
K18 hair care products with ressilicore heat-shielding technology on a pink background
Two K18 HeatBounce hair care products on a colorful background
Three women with styled hair against a colorful background with text about heat protection + conditioning for healthy, vibrant, shiny hair
have questions?

still have questions? visit our help center

How does HeatBounce work?

HeatBounce is powered by resilicore™ heat-shielding technology is a breakthrough innovation inspired by resilin—a natural protein that can withstand extreme temperatures. Unlike traditional heat protectants that only coat the cuticle, the size + molecular makeup of resilicore™ allows it to penetrate deeper than ever before*, into the cortex where heat damage can occur, forming a protective shield that fortifies from within.

How often can I reapply HeatBounce?

Apply HeatBounce every time you apply heat, including if you switch between blow drying to hot tools.

When do I use it in my routine?

First apply the PRO mist, wait 4 minutes, then shampoo and skip conditioner. Apply the PRO mask, and wait 4 minutes. This is when you apply HeatBounce and AstroLift™ before blowdrying or airdrying. If using hot tools, apply HeatBounce again. Finish with K18 oil and use AirWash™ to extend the look out of the salon, and recommend clients to use it between washes.

Is the K18PEPTIDE™ in HeatBounce?

No. HeatBounce features a new K18 innovation—resilicore™ heat-shielding technology. This innovation is inspired by resilin—a natural protein known for its ability to withstand extreme temperatures and store energy. resilicore™ penetrates deep into hair’s cortex, forming a protective shield that fortifies the hair from within.

Powered by resilicore™

Inspired by proteins in nature that can withstand extreme temperatures.

Explore the Science Explore the Science

heat protect + condition in one step

how to use HeatBounce

1. Apply throughout sectioned hair, brushing through to help with even distribution.

2. Less is more. Start small and build as needed. Hair should feel soft and tangle-free, but not coated.

3. Use on towel-dried hair before blow drying and on dry hair before hot tools.

learn more on our blog
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See how K18 unlocks our community's expression

4.8
Rated 4.8 out of 5 stars
Based on 547 reviews
98%would recommend these products
Reviews Summary
Customers say this heat protectant spray leaves their hair soft, shiny, and protected from heat styling. Many reviews highlight the pleasant scent and lightweight formula that doesn't weigh hair down or leave residue. Common feedback includes reduced frizz, improved manageability, and less breakage with regular use. Users appreciate its versatility on both damp and dry hair, and note it works well as a detangler and leave-in conditioner. Some mention it goes a long way, though a few note it can feel slightly heavy or sticky. Overall, customers find it effective for maintaining hair health during heat styling.
Customers Talked About
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547 reviews
  • Diana G.
    Verified Buyer
    Reviewing
    HeatBounce conditioning heat protectant 4oz
    I recommend this product
    Age 65+
    Hair Concern Color-care, Heat damage
    Hair Type Fine/Thin
    My Results Visible Difference, Shinier Hair
    Rated 5 out of 5 stars
    2 hours ago
    Heat Bounce

    Love the spray I use it every time I wash my hair before I blow dry

    Was this helpful?
    K18Hair PRO
    1 hour ago

    Thank you so much for your amazing 5-star review, Diana! We're thrilled that HeatBounce has become part of your hair care routine. Your support means everything to us! 💖✨

  • vicky c.
    Verified Buyer
    Reviewing
    HeatBounce conditioning heat protectant 4oz
    I recommend this product
    Age 55 - 64
    Hair Concern Heat damage, Color-care, Extending time between washes, Fragile/brittle hair, Split-Ends
    Hair Type Fine/Thin, Straight/Wavy
    My Results Less Frizz, Stronger Hair, Less Breakage, Soft Touchable Hair, Odor eliminated
    Rated 5 out of 5 stars
    2 days ago
    Dry time

    Since I started using this product every time I dry my hair, I’ve noticed a difference. My hair is straighter and smoother when I use it with the oil and mask the drying process has become smoother and easier to manage.

    Was this helpful?
    K18Hair PRO
    2 days ago

    Thank you so much for your amazing review! We're thrilled that HeatBounce is making your dry time smoother and easier to manage. Your support means everything to us! 💙

  • Shirley Y.
    Verified Buyer
    Reviewing
    HeatBounce conditioning heat protectant 4oz
    I recommend this product
    Age 55 - 64
    Hair Concern Fragile/brittle hair, Split-Ends, Chemical damage, Color-care, Dryness
    Hair Type Fine/Thin, Straight/Wavy, Grey Hair
    My Results Less Frizz, Visible Difference, Smoother Hair, Less Breakage, Soft Touchable Hair
    Rated 5 out of 5 stars
    3 days ago
    Heatbounce

    Totally love this conditioning heat protection! Makes my hair soft & less damaged from hair dryer & straightener. I use it every day.

    Was this helpful?
    K18Hair PRO
    3 days ago

    Thank you so much for your amazing review! 💜 We're thrilled you're loving HeatBounce and that it's keeping your hair soft and protected from daily heat styling. We appreciate your support! ✨

  • Alicia F.
    Verified Buyer
    Reviewing
    HeatBounce conditioning heat protectant 4oz
    I recommend this product
    Age 45 - 54
    Hair Concern Color-care, Heat damage, Extending time between washes
    Hair Type Medium Density
    My Results Bouncy Hair, Visible Difference, Smoother Hair, Soft Touchable Hair, Cleaner, fresher hair
    Rated 5 out of 5 stars
    3 days ago
    Heat bounce

    This product is worth every penny. It leaves my hair looking fresh and enhances my style . Will by again.

    Was this helpful?
    K18Hair PRO
    3 days ago

    Thank you so much for your amazing 5-star review, Alicia! 💜 We're thrilled that HeatBounce is leaving your hair looking fresh and enhancing your style. We appreciate your support! ✨

  • judith P.
    Verified Buyer
    Reviewing
    HeatBounce conditioning heat protectant 4oz
    I recommend this product
    Age 65+
    Hair Concern Frizz, Dryness, Split-Ends, Fragile/brittle hair, Heat damage
    Hair Type Fine/Thin
    My Results Less Frizz, Bouncy Hair, Visible Difference, Stronger Hair, Less Breakage
    Rated 5 out of 5 stars
    4 days ago
    This is wonderful ❤️

    Heatbounce is absolutely wonderful in every way from the smell to the protection

    I love ALL the K-18 products and the customer service 😍

    Was this helpful?
    K18Hair PRO
    4 days ago

    Thank you so much for your amazing review! 💙 We're thrilled you're loving HeatBounce and all of our K18 products. We appreciate your support! ✨

*Disclaimers