K18 Biomimetic HairscienceHeatBounce Conditioning Heat Protectant - Conditioning Heat Protectant
Highlights
Leave-in conditioning heat protectant detangles, softens, and delivers deeper heat protection than ever before*—for 85% less breakage after blow drying*.
protects up to 232℃, delivering deeper heat protection than ever before*
85% less breakage after blow drying*
Lightweight formula conditions, softens and detangles even damaged hair
Conditions, softens, and detangles even damaged hair
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.
Directions
Apply throughout sectioned hair, brushing through to help with even distribution. Use on towel-dried hair before blow drying and on dry hair before hot tools.
Test results
Heat protection up to 232℃ from the cuticle to the cortex**Heat protection observed on hair in clinical testing after application of HeatBounce and use of 450℉ (232℃) flat iron on dry hair
85% less breakage after blow drying*
*Reduction in hair breakage observed in clinical testing after application of high heat blow dry on wet hair
*k18hair.com/disclaimers
More information
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. \n\nCreated for all hair types + textures. Can be used on extensions.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.
This list of ingredients may be subject to change, please consult the packaging of the product purchased.
Free gift
FREE Heat Protectant 15ml, when you spend £50 on K18 Biomimetic Hairscience.*
*One free gift per order. Valid until 28th September or whilst stock lasts. Your free gift will automatically add to the shopping bag page. Total at order summary must be £50 or more worth of K18 Biomimetic Hairscience products, after any Promotion Code, Brands You Love discount and before delivery charges are applied. Cannot be used in conjunction with any other Promotion and this offer is not applicable to previously made or pending purchases.
Excludes Gift Voucher, Sephora Favourites Advent Calendar and Fragrance Gift Box purchases. This offer is available online at Sephora.co.uk to UK Mainland customers only.
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Rated 5 out of
5
by
RANIA from
Really happy with this product.
Amazing results It doesn’t weigh my hair down at all and really helps protect against heat damage. I’ll definitely be repurchasing! 💕
Date published: 2026-04-19
Rated 5 out of
5
by
Melanie from
Love love love
Second time purchasing now, absolutely love this heat protector. It's a must!
Date published: 2026-02-11
Rated 5 out of
5
by
Beth from
Lovely!
I really love this product and kind of wish I didn’t because of the price. But it’s a lovely spray I mainly use it on wet hair but have used it on dry a couple of times and it didn’t go greasy!
Date published: 2026-02-08
Rated 5 out of
5
by
Lidia from
Good for colour treated hair
The best heat protectant I have used , worth the money. I’m not someone who uses heat to style hair often , but when I do this is the heat protectant I will use. Found it has improved the texture of my hair when I do use it , my hair doesn’t feel dry after heat styling and smells good
Date published: 2026-01-11
Rated 5 out of
5
by
Shaney from
This is the one you want if your serious hair care
Was worried about the price and worth it but it is 100% worth it hair feels so soft! 10/10 would buy again
Date published: 2025-09-11
Rated 4 out of
5
by
Tracey from
Couldn’t wait to try this
Does what it says felt hair less frizzy and fly away after
Date published: 2025-09-04
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