Perfectly straight smooth and shiny hair is a sign of healthy hair and 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 450c heat proof ingredients the spray creates a long lasting flat effect through its humidity protection whilst smoothing and reducing unwanted frizz to use spray onto damp hair and dry the hair completely with a blow dryer secti