The instant disclosure relates to methods for treating hair, for example, methods for imparting desirable cosmetic properties to the hair, especially hair treated with a chemical treatment composition. The methods include: applying a hair-treatment composition to chemically treated hair, for example, within 30 minutes from when a chemical treatment composition is rinsed from the hair, the hair-treatment composition comprising: one or more polyurethane latex polymers; and rinsing the hair-treatment composition from the hair within 30 minutes from applying the hair-treatment composition to the hair. After rinsing the hair-treatment composition from the hair, the hair may be subsequently dried and styled.