Perfectly straight, smooth & shiny hair is a sign of healthy hair & vitality, but the use of straightening irons can have an adverse effect if the hair gets too hot. Osis Flatliner Heat Protection Spray lets you create sleek hair with ultra flat control. Using 450?C heat-proof ingredients, the spray creates a long lasting flat effect through its humidity protection, whilst smoothing & reducing unwanted frizz. To use: Spray onto damp hair & dry the hair completely with a blow-dryer. Section the hair & finish the desired style with a heating device.