Hair fixative gels are widely used to create and maintain a variety of hairstyles. The fixative polymer plays a crucial role in the formulation to provide hair styling performances which are hardness (stiffness) and hold (curl retention). Many generations of polymers have different humidity resistance properties, which determine both the holding power and the lack of tack in humid climates. This study was, therefore, to evaluate the performances of the fixative polymers which were frequently used in commercial hair gels in Thailand. In addition, the impact of humidity on the polymers was investigated. The polymers were chosen based on the survey of hair gel ingredients. Fixative performances i.e. stiffness and curl retention were tested in the virgin Thai hair. Among 25 hair styling products, polyacrylic acid and PVP were the most popular followed by acrylates copolymer, polyvinylpyrrolidone/vinyl acetate (VP/VA) copolymer, polyquaternium-86, respectively. Polyacrylic acid showed the highest stiffness and curl retention referring to the best performances for hair styling products. PVP K-90 was another interesting polymer that provided a good stiffness for Thai hair while polyquaternium-86 was good at curl retention. Furthermore, the polymer characteristics were changed by the high humidity condition depended on resistance ability to water of each polymer. The humidity resistance was found in the hair treated with VP/VA copolymer or VP/Methacrylamide/Vinyl Imidazole copolymer.