A quality heat protectant spray for straightening hair NZ shoppers can trust won’t repair existing damage, but it will help prevent more from happening. The new K18 Heatbounce is a great choice, combining leave-in conditioning with advanced heat protection to keep your hair strong and resilient. Another option is De Lorenzo Extinguish, enriched with Argan Oil to nourish while shielding your hair from straighteners, curlers, and dryers.