A cosmetic agent for treating a keratin material, comprising a) at least one organosilicon compound, wherein the at least one organosilicon compound comprises a compound of formula (I) and at least one organosilicon compound of formula (IV), where, in the organosilicon compound of formula (I), R 1 R 2 N-L-Si(OR 3 ) a (R 4 ) b (I), - R 1 and R 2 both represent a hydrogen atom, - L represents a linear, divalent C 1 -C 6 alkylene group, preferably a propylene group (-CH 2 -CH 2 -CH 2 -) or an ethylene group (-CH 2 -CH 2 -), - R 3 and R 4 represent, independently of one another, a methyl group or an ethyl group, - a represents the number 3, and - m represents the number 0, and where, in the organosilicon compound of formula (IV), R 9 Si(OR 10 ) k (R 11 ) m (IV), - R 9 represents a C 1 -C 12 alkyl group, - R 10 represents a hydrogen atom or a C 1 -C 6 alkyl group, - R 11 represents a C 1 -C 6 alkyl group, - k represents an integer from 1 to 3, and - m represents the integer 3 - k, and b) pyrrolidone carboxylic acid or a salt of pyrrolidone carboxylic acid. a) at least one organosilicon compound, wherein the at least one organosilicon compound comprises a compound of formula (I) and at least one organosilicon compound of formula (IV), where, in the organosilicon compound of formula (I), R 1 R 2 N-L-Si(OR 3 ) a (R 4 ) b (I), - R 1 and R 2 both represent a hydrogen atom, - L represents a linear, divalent C 1 -C 6 alkylene group, preferably a propylene group (-CH 2 -CH 2 -CH 2 -) or an ethylene group (-CH 2 -CH 2 -), - R 3 and R 4 represent, independently of one another, a methyl group or an ethyl group, - a represents the number 3, and - m represents the number 0, and where, in the organosilicon compound of formula (IV), R 9 Si(OR 10 ) k (R 11 ) m (IV), - R 9 represents a C 1 -C 12 alkyl group, - R 10 represents a hydrogen atom or a C 1 -C 6 alkyl group, - R 11 represents a C 1 -C 6 alkyl group, - k represents an integer from 1 to 3, and - m represents the integer 3 - k, and where, in the organosilicon compound of formula (I), R 1 R 2 N-L-Si(OR 3 ) a (R 4 ) b (I), - R 1 and R 2 both represent a hydrogen atom, - L represents a linear, divalent C 1 -C 6 alkylene group, preferably a propylene group (-CH 2 -CH 2 -CH 2 -) or an ethylene group (-CH 2 -CH 2 -), - R 3 and R 4 represent, independently of one another, a methyl group or an ethyl group, - a represents the number 3, and - m represents the number 0, and - R 1 and R 2 both represent a hydrogen atom, - L represents a linear, divalent C 1 -C 6 alkylene group, preferably a propylene group (-CH 2 -CH 2 -CH 2 -) or an ethylene group (-CH 2 -CH 2 -), - R 3 and R 4 represent, independently of one another, a methyl group or an ethyl group, - a represents the number 3, and - m represents the number 0, and where, in the organosilicon compound of formula (IV), R 9 Si(OR 10 ) k (R 11 ) m (IV), - R 9 represents a C 1 -C 12 alkyl group, - R 10 represents a hydrogen atom or a C 1 -C 6 alkyl group, - R 11 represents a C 1 -C 6 alkyl group, - k represents an integer from 1 to 3, and - m represents the integer 3 - k, and - R 9 represents a C 1 -C 12 alkyl group, - R 10 represents a hydrogen atom or a C 1 -C 6 alkyl group, - R 11 represents a C 1 -C 6 alkyl group, - k represents an integer from 1 to 3, and - m represents the integer 3 - k, and b) pyrrolidone carboxylic acid or a salt of pyrrolidone carboxylic acid. <EOS>