Goldwell Style Sign Ultra Volume Double Boost is a styling spray that instantly thickens and volumizes the hair. Invigorates and adds instant root lift. For fine and limp roots. Hold factor: 4 from 5 Benefits invigorates and adds instant root lift instant injection of massive volume long-lasting shape, volume with strong, yet flexible hold fixation without any stickiness or residue natural movement and reliable hold heat and color protection Technology FlexPROtec Complex Product-specific styling polymers and bamboo proteins create any desired look and help to keep the style natural and flexible. A new, unique elastomer and UV filter in all products help protect the hair from premature color fade, damaging effects of heat styling and UV-light. The hair surface is smoothened to enhance natural shine. Hair spray suitable for all hair types especially beneficial for fine, limp roots.