Goldwell Stylesign Heat Styling Smoothing Serum Spray 100mL Duo is the ultimate solution for sleek, frizz-free hair with long-lasting smoothness. This advanced formula provides heat protection up to 230°C/446°F, ensuring hair stays shielded from damage while enhancing a silky-straight finish. Designed to fight humidity and reduce flyaways, it allows your flat iron to glide effortlessly, locking in a polished, professional look. Shields against humidity Reduces flyaways Enhances straight, silky finish Paraben-free and colour-safe Kit includes:  2 x 100mL Stylesign Heat Styling Smoothing Serum Spray Who is it for? All hair types Those wanting sleek, frizz-free hair who use heat styling tools What does it do? Protects hair up to 230°C Keeps style smooth and long-lasting Helps flat iron glide effortlessly Locks out humidity for frizz control How do you use it? Use on dry hair Style as desired