The instant disclosure relates to essentially anhydrous hair-treatment compositions. The anhydrous hair-treatment compositions typically include: one or more polyurethane latex polymers; one or more bis-urea derivatives; and one or more solvents. Additional components such as silicones, auxiliary agents, etc., can also be included. The instant disclosure also relates to kits that include the essentially anhydrous hair-treatment compositions and to methods for treating hair with the essentially anhydrous hair-treatment compositions.