Set spray hair, a hair styling product that is typically applied as a finishing touch, is a type of aerosol spray that contains polymers that help to hold hair in place.
It is commonly used to keep hairstyles intact for special occasions or windy conditions. Set spray hair has been used for decades, with the first commercial product introduced in the 1950s. The polymers in the spray form a thin film around the hair shafts, which helps to keep them in place and prevent frizz.