K18 HeatBounce conditioning heat protectant bottle on a pink background

HeatBounce conditioning heat protectant 118 mL

Before and after comparison of a woman's hair with K18 HeatBounce product.

Before and after comparison of a woman with hair treated using K18 products.

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K18 HeatBounce heat protectant and oil on a colorful background with text highlighting features.

K18 heat bounce and hair mask products on a pink background with text about damage repair and protection.

Four women using a hair styling tool with text indicating different styles you can do with heatbounce.

Three women with styled hair against a colorful background with text about hair care.

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4.8

Rated 4.8 out of 5 stars

524 Reviews

HeatBounce conditioning heat protectant

Name: HeatBounce conditioning heat protectant 118 mL
Brand: K18Hair
SKU: K18-35092
Price: 48.00 GBP
Availability: InStock

The future of heat protection

HeatBounce conditioning heat protectant 118 mL £48.00

Description

This leave-in conditioning heat protectant detangles, softens, and delivers deeper heat protection than ever before*—for 85% less breakage after blow drying⁷.

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

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.

Key benefits

Protects from heat up to 232°C

85% less breakage after blow drying⁷

Lightweight formula conditions, softens, and detangles even damaged hair

*Heat protection observed on hair in clinical testing after application of HeatBounce and use of 450℉ (232℃) flat iron on dry hair.

¹Results observed as a reduction in hair breakage in scientific testing after application of HeatBounce and use of 232℃ flat iron on dry hair.

²Results observed as an increase in protein stability in scientific testing after application of HeatBounce on damp hair and exposure to 232℃ flat iron on dry hair.

³Results observed as a reduction in color change in scientific testing after application of HeatBounce on dry hair and use of 232℃ flat iron.

⁴Results observed as a reduction in hair breakage in scientific testing after application of HeatBounce on dry hair and use of 232℃ flat iron.

⁵Results observed as a reduction in hair breakage in scientific testing after application of HeatBounce on dry hair and use of 232℃ flat iron.

⁶Results observed as an increase in protein stability in scientific testing after repeated exposure to UV and HeatBounce application.

⁷Reduction in hair breakage observed in clinical testing after application of high heat blow dry on wet hair.

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.

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Description

This leave-in conditioning heat protectant detangles, softens, and delivers deeper heat protection than ever before*—for 85% less breakage after blow drying⁷.

got questions?

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Is HeatBounce activated by heat?

No, HeatBounce does not need to be activated to protect from heat.

Do I have to wait to use heat after applying HeatBounce?

No, you can blow dry or use hot tools immediately after applying HeatBounce.

How is HeatBounce different from traditional heat protectants?

HeatBounce is powered by resilicore™ heat-shielding technology, an innovation inspired by resilin—a natural protein that can withstand extreme temperatures. Unlike traditional heat protectants that only coat the outside cuticle layer of hair, 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.
*k18hair.co.uk/disclaimers

What’s the difference between molecular repair hair oil and HeatBounce?

While the molecular repair hair oil and HeatBounce have heat protection benefits, HeatBounce defends against heat from the cuticle to the cortex*, going as deep as heat damage goes to help protect against colour fade, dry feeling, dullness, and breakage. The oil delivers traditional heat protection on the outer layers of hair and clinically proven damage repair.
*k18hair.co.uk/disclaimers

When do I use HeatBounce in my routine?

After shampooing, apply the K18 mask (wait 4 minutes) or DAMAGE SHIELD conditioner. Then, apply HeatBounce and AstroLift™ before blow drying or air drying. Use HeatBounce again before any hot tools. Finish with K18 oil and use AirWash™ to refresh hair between washes.

How often can I reapply HeatBounce?

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

the future of heat protection

less breakage after blow drying*

degrees C heat protection from cuticle to cortex*

Inspired by proteins in nature that can withstand extreme temperatures.

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

feel what's possible with K18

See how K18 unlocks our community's expression

4.8

Rated 4.8 out of 5 stars

Based on 524 reviews

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524 reviews

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Theresa H.
Verified Buyer
Reviewing
HeatBounce conditioning heat protectant 118 mL
I recommend this product
Age 55 - 64
Hair Concern Chemical damage, Heat damage, Color-care, Frizz, Dryness
Hair Type Fine/Thin, Thick/Coarse, Straight/Wavy, Grey Hair
My Results Less Frizz, Bouncy Hair, Visible Difference, Stronger Hair, Soft Touchable Hair
Rated 5 out of 5 stars
7 minutes ago
LOVE HEATBOUNCE !!
I absolutely LOVE this product and use it everyday! A little goes a long way. It's a great way to refresh hair between shampoos. Prefer using HeatBounce over using the K18.. Compliments K18 Dry Shampoo
Was this helpful?
Luisa R.
Verified Buyer
Reviewing
HeatBounce Deluxe sample
I recommend this product
Rated 5 out of 5 stars
4 days ago
good product
Hair feels softer and less frizzy
Was this helpful?
KU
K18Hair UK
3 days ago
Thank you so much, Luisa! ✨ We're thrilled to hear the HeatBounce Deluxe sample left your hair feeling softer and less frizzy—that's exactly what we love to see! 💛 Thanks for your fantastic 5-star review and for giving it a try! 🙌
Jane G.
Verified Buyer
Reviewing
HeatBounce conditioning heat protectant 118 mL
I recommend this product
Age 45 - 54
Hair Concern Split-Ends, Dryness
Hair Type Fine/Thin
My Results Visible Difference, Smoother Hair, Shinier Hair
Rated 5 out of 5 stars
1 week ago
HeatBounce conditioning heat protectant
Leaves my hair shiney , healthy and super straight with using the flat iron. Love this product!
Was this helpful?
KU
K18Hair UK
1 week ago
Thank you so much for your fantastic review, Jane! 💖 We're absolutely thrilled to hear that HeatBounce is giving you such amazing results - shiny, healthy, and super straight hair sounds perfect! It's wonderful to know our conditioning heat protectant is delivering exactly what you're looking for with your flat iron routine. Your 5-star review means the world to us!
Jessica M.
Verified Buyer
Reviewing
HeatBounce conditioning heat protectant 118 mL
I recommend this product
Age 35 - 44
Hair Concern Chemical damage, Heat damage, Color-care, Fragile/brittle hair, Split-Ends
Hair Type Fine/Thin
My Results Less Frizz, Less Breakage, Stronger Hair, Defined Curl/Wave Pattern, Soft Touchable Hair
Rated 5 out of 5 stars
3 weeks ago
That smell!!
Wow this stuff smells soooooookoo good wow!!!
Was this helpful?
KU
K18Hair UK
2 weeks ago
Thank you so much for this amazing review, Jessica! We're absolutely thrilled to hear that you love the scent of our HeatBounce conditioning heat protectant! Your excitement about the fragrance truly makes our day and means the world to us - we're so grateful to have you as part of our K18 community! 💛
Tara W.
Verified Buyer
Reviewing
HeatBounce Deluxe sample
Rated 3 out of 5 stars
1 month ago
Going well so far!
I have used it for three washes now and I am really liking it so far. I’m using it with the K 18 program and seeing results!
Was this helpful?
KU
K18Hair UK
3 weeks ago
Thank you so much for this wonderful review, Tara! We're thrilled to hear that you're really liking HeatBounce Deluxe after just three washes and that you're already seeing results when using it as part of your K18 program! It's fantastic that you're experiencing positive changes so quickly - that's exactly what we hoped to achieve with this heat protection formula. We're so grateful to have you as part of our K18 community and appreciate you taking the time to share your experience!

*Disclaimers