Polymer composition containing a. at least one thermoplastic which is transparent in the visible region; b. at least lanthanum hexaboride and optionally further inorganic IR absorbers from the group which comprises boride compounds and tungstates and mixtures thereof, c. optionally an inorganic, nano-scale pigment, d. a colouring agent combination of structures selected from: I. and/or,, II. and/or,,, III. and/or,,, IV.,, V.,, VI.,,, VII., and/or,, VIII. and/or,, where the structures are as follows: 1a, 1b: where - Ra and Rb independently of one another represent a linear or branched alkyl radical, or halogen; - n independently of the respective R represents a natural number from 0 to 3, the radical for n=0 being hydrogen; 3: where R is selected from the group consisting of H and p-methylphenylamine radical; 4: where R3 is halogen; n=4; 5: 6: 7: where - R1 and R2 independently of one another represent a linear or branched alkyl radical, or halogen; - n represents a natural number from 0 to 4 and where the bulk volume of the colouring agent of the structure, determined in accordance with DIN ISO 787-11, is from 2 l/kg to 10 l/kg, its specific surface area, determined in accordance with DIN 66132, is from 5 m 2 /g to 60 m 2 /g, and its pH, determined in accordance with DIN ISO 787-9, is from 4 to 9; 8a, 8b: where - the radicals R each independently of the others are hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, neopentyl, hexyl, thexyl, fluorine, chlorine, bromine, sulfone or CN and - M is selected from the group comprising aluminium, nickel, cobalt, iron, zinc, copper and manganese. a. at least one thermoplastic which is transparent in the visible region; b. at least lanthanum hexaboride and optionally further inorganic IR absorbers from the group which comprises boride compounds and tungstates and mixtures thereof, c. optionally an inorganic, nano-scale pigment, d. a colouring agent combination of structures selected from: I. and/or,, II. and/or,,, III. and/or,,, IV.,, V.,, VI.,,, VII., and/or,, VIII. and/or,, I. and/or,, II. and/or,,, III. and/or,,, IV.,, V.,, VI.,,, VII., and/or,, VIII. and/or,, 1a, 1b: where - Ra and Rb independently of one another represent a linear or branched alkyl radical, or halogen; - n independently of the respective R represents a natural number from 0 to 3, the radical for n=0 being hydrogen; - Ra and Rb independently of one another represent a linear or branched alkyl radical, or halogen; - n independently of the respective R represents a natural number from 0 to 3, the radical for n=0 being hydrogen; 3: where R is selected from the group consisting of H and p-methylphenylamine radical; 4: where R3 is halogen; n=4; R3 is halogen; n=4; 5: 6: 7: where - R1 and R2 independently of one another represent a linear or branched alkyl radical, or halogen; - n represents a natural number from 0 to 4 and where the bulk volume of the colouring agent of the structure, determined in accordance with DIN ISO 787-11, is from 2 l/kg to 10 l/kg, its specific surface area, determined in accordance with DIN 66132, is from 5 m 2 /g to 60 m 2 /g, and its pH, determined in accordance with DIN ISO 787-9, is from 4 to 9; - R1 and R2 independently of one another represent a linear or branched alkyl radical, or halogen; - n represents a natural number from 0 to 4 and 8a, 8b: where - the radicals R each independently of the others are hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, neopentyl, hexyl, thexyl, fluorine, chlorine, bromine, sulfone or CN and - M is selected from the group comprising aluminium, nickel, cobalt, iron, zinc, copper and manganese. - the radicals R each independently of the others are hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, neopentyl, hexyl, thexyl, fluorine, chlorine, bromine, sulfone or CN and - M is selected from the group comprising aluminium, nickel, cobalt, iron, zinc, copper and manganese.