Goldwell Stylesign Sleek Perfection Thermal serum gives beautiful, sleek hair that lasts all day with this waterless serum. Goldwell StyleSign Sleek Perfection Thermal Spray Serum speeds up the straightening process, and with added humidity protection, you’ll relish in hassle free, silky straight hair. This product is an absolute essential for anyone who wants to enjoy sleek, smooth and shiny locks. This easy to use spray can be used straight onto dry hair before straightening. This Goldwell product has no hold factor.