A hair volumizing spray, a styling product applied to hair to increase its volume and give it a fuller appearance, is a type of aerosol hairspray containing polymers that coat the hair shaft, making it thicker. An example of a hair volumizing spray is a root lifter, which is applied to the roots of the hair to create volume at the crown.
Hair volumizing sprays are relevant because they can help people with thin or fine hair achieve the appearance of thicker, fuller hair. They can also be used to create a variety of hairstyles, such as bouffants and updos. One key historical development in the evolution of hair volumizing sprays was the invention of the aerosol can in the 1940s, which made it possible to apply the product evenly to the hair.