Polymer composition comprising components (a), (b) and (c): (a) 33 to 52 wt.-% of at least one star-shaped block copolymer (a) which comprises at least two terminal polymer blocks S 1 and S 2 made from vinylaromatic monomers, in particular styrene, and at least one random copolymer block (B/S) made from 20 to 60 wt.-% vinylaromatic monomer, in particular styrene, and from 40 to 80 wt.-% diene, in particular 1,3-butadiene, and where the total block copolymer (a) is made from 50 to 85 wt.-% vinylaromatic monomer, in particular styrene, and from 15 to 50 wt.-% diene, in particular 1,3-butadiene; (b) 48 to 67 wt.-% of at least one copolymer (b) made from 65 to 90 wt.-% vinylaromatic monomer, in particular styrene, and 10 to 35 wt.-% methyl methacrylate; and optionally (c) 0 to 5 wt.-% of one or more additive(s) and/or processing aid (c), wherein • the total amount of components (a), (b) and (c) is 100 wt.-%; • the star-shaped block copolymer (a) has structures in which the star has at least one branch having the block sequence S 1 -(B/S) 1 -(B/S) 2 and at least one branch having the block sequence S 2 -(B/S) 1 (B/S) 2, or in which the star has at least one branch with the block sequence S 1 -(B/S) 1 -(B/S) 2 -S 3 and at least one branch with the block sequence S 2 -(B/S) 1 -(B/S) 2 -S 3, wherein: M n of S 1 is from 5,000 to 30,000 g/mol; M n of S 2 is from 35,000 g/mol to 150,000 g/mol; and S 3 is a further polymer block made from vinylaromatic monomers with M n being smaller than 2,500 g/mol; and the random copolymer block (B/S) 1 is made from 40 to 60 wt.-% vinylaromatic monomer, in particular styrene, and from 40 to 60 wt.-% diene, in particular 1,3-butadiene, and the random copolymer block (B/S) 2 is made from 20 to 39 wt.-% vinylaromatic monomer, in particular styrene, and from 61 to 80 wt.-% diene, in particular 1,3-butadiene. (a) 33 to 52 wt.-% of at least one star-shaped block copolymer (a) which comprises at least two terminal polymer blocks S 1 and S 2 made from vinylaromatic monomers, in particular styrene, and at least one random copolymer block (B/S) made from 20 to 60 wt.-% vinylaromatic monomer, in particular styrene, and from 40 to 80 wt.-% diene, in particular 1,3-butadiene, and where the total block copolymer (a) is made from 50 to 85 wt.-% vinylaromatic monomer, in particular styrene, and from 15 to 50 wt.-% diene, in particular 1,3-butadiene; (b) 48 to 67 wt.-% of at least one copolymer (b) made from 65 to 90 wt.-% vinylaromatic monomer, in particular styrene, and 10 to 35 wt.-% methyl methacrylate; and optionally (c) 0 to 5 wt.-% of one or more additive(s) and/or processing aid (c), • the total amount of components (a), (b) and (c) is 100 wt.-%; • the star-shaped block copolymer (a) has structures in which the star has at least one branch having the block sequence S 1 -(B/S) 1 -(B/S) 2 and at least one branch having the block sequence S 2 -(B/S) 1 (B/S) 2, or in which the star has at least one branch with the block sequence S 1 -(B/S) 1 -(B/S) 2 -S 3 and at least one branch with the block sequence S 2 -(B/S) 1 -(B/S) 2 -S 3, wherein: M n of S 1 is from 5,000 to 30,000 g/mol; M n of S 2 is from 35,000 g/mol to 150,000 g/mol; and S 3 is a further polymer block made from vinylaromatic monomers with M n being smaller than 2,500 g/mol; and the random copolymer block (B/S) 1 is made from 40 to 60 wt.-% vinylaromatic monomer, in particular styrene, and from 40 to 60 wt.-% diene, in particular 1,3-butadiene, and the random copolymer block (B/S) 2 is made from 20 to 39 wt.-% vinylaromatic monomer, in particular styrene, and from 61 to 80 wt.-% diene, in particular 1,3-butadiene. M n of S 1 is from 5,000 to 30,000 g/mol; M n of S 2 is from 35,000 g/mol to 150,000 g/mol; and S 3 is a further polymer block made from vinylaromatic monomers with M n being smaller than 2,500 g/mol; and the random copolymer block (B/S) 1 is made from 40 to 60 wt.-% vinylaromatic monomer, in particular styrene, and from 40 to 60 wt.-% diene, in particular 1,3-butadiene, and the random copolymer block (B/S) 2 is made from 20 to 39 wt.-% vinylaromatic monomer, in particular styrene, and from 61 to 80 wt.-% diene, in particular 1,3-butadiene.