Schwarzkopf OSiS+ Flatliner. Deeply conditioning, the Schwarzkopf OSiS Flatliner Heat Protection Spray creates a veil over your hair, shielding every strand from the consequences of heat damage, humidity and styling tools up to 230°C. Suitable for use on damp or dry locks, the non-sticky spray works to prevent split ends and reduce breakage, leaving you with healthy-looking, super smooth strands from root to tip. Provides strong control, allowing you to create a salon-worthy finish from home.