Compositions and methods for improving the appearance of the hair

A method for improving curl definition of keratin fibers curly hair, said method comprising:

• applying to the keratin fibers a composition comprising:
• a first part (a) comprising:
• (a) at least one compound chosen from urea and urea derivatives;
• and
• a second part (b) comprising:
• (b) at least one polyol compound chosen from propylene glycol, butylene glycol, 1,3-propanediol 1,3-butylene glycol, 1,2-pentanediol, dipropylene glycol, hexylene glycol, pentylene glycol, glycerol, ethylene glycol, or mixtures thereof;
• at least one aminosilicone;
• and at least one solvent chosen from a monoalcohol;
• wherein the weight ratio of the total amount of compound chosen from urea and urea derivatives, to the total amount of polyol, ranges from about 0.1 to about 1.5;
• and
• heating the keratin fibers to a temperature of at least 100° C.;
• wherein the method does not include a fixing step.