K18 HeatBounce Conditioning Heat Protectant

K18 HeatBounce Conditioning Heat Protectant is a leave-in heat protectant made for anyone who blow-dries, flat-irons, or curls their hair regularly — all hair types and textures, extensions included. It applies as a lightweight, conditioning leave-in that brushes through easily and leaves hair feeling soft and tangle-free rather than coated or stiff. There's no waiting around for it to activate: hair can go straight under the blow dryer or hot tool the moment it's applied.

Section hair and apply throughout towel-dried strands before blow drying, or onto dry hair before using hot tools, brushing through for even distribution — a little goes a long way. At the center of the formula is resilicore™, K18's heat-shielding technology inspired by resilin, a protein found in nature that withstands extreme temperatures. Unlike traditional heat protectants that only coat the outside of the hair cuticle, resilicore™ is designed to penetrate deeper, into the hair's inner cortex where heat damage actually occurs, forming a protective shield that reinforces hair from within. A conditioning blend works alongside it on the surface to soften and detangle, even on hair that's already damaged, for heat protection up to 450°F (232°C).

Key Benefits

• resilicore™ heat-shielding technology is designed to penetrate into hair's inner cortex, where heat damage occurs, rather than just coating the cuticle surface.
• Protects against heat up to 450°F (232°C) whether from a blow dryer, flat iron, or curling iron.
• Conditioning blend softens and detangles even damaged hair without weighing it down.
• No activation time needed — hair can be styled with heat immediately after application.
• Lightweight, leave-in formula works on all hair types and textures, including extensions.
• Helps reduce heat-related breakage compared to blow drying with no protection at all.

The result is hair that feels conditioned and protected at every stage of styling, from blow dry to final curl.