Descriptions Osis Flatliner Heat Protection Spray works to protect hair against thermal styling damage whilst taming frizz and flyaways. Deeply conditioning, 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. Osis Flatliner Flattening Iron Serum has an OSiS Control Level of 3 for strong control, natural movement and style. Directions of use Spray onto damp hair and dry the hair completely with a blow-dryer Section the hair and finish the desired style with a heating device