Osis Flatliner Iron Serum is an essential tool for giving straightened hair the extra care and protection it needs. With 200 Degree C' heat-proof ingredients this serum will provide flawless protection when you use hot styling irons.Flatliner Flattening Iron Serum. Sleek. Strong Control.Features:- Ultra flat control- 200°C heat proof ingredients- Long lasting ultra flat shiny, silky looking hair- Humidity protectionDirection for use:Spray into wet hair. Roughly dry the hair completely. For very sleek locks, use a paddle brush to blow-dry. Section and iron the hair immediately.On extreme thick hair types, you can additionally spray onto dry hair & iron immediately.Schwarzkopf Osis Flatliner Iron Serum features hydrolyzed silk and wheat proteins, which provide a smooth silky finish, smoothing and reducing frizz from curly and wavy hair.