Disclosed herein is a cosmetic product for treating keratin fibers, for example, human keratin fibers such as the hair, comprising at least one polymerizable cyanoacrylate monomer, and at least one non-ionic polyurethane, wherein the at least one polymerizable cyanoacrylate monomer and the at least one non-ionic polyurethane may be present in the same composition or in separate form, and may be applied, at the time of use, either together, separately, simultaneously, or sequentially over the time. Further disclosed herein is a cosmetic composition comprising at least one polymerizable cyanoacrylate monomer and at least one non-ionic polyurethane. Still further disclosed herein are methods for treating, dyeing, and/or conditioning keratin fibers comprising applying to the fibers at least one composition of the present disclosure.