A monophasic polypropylene composition, having a melt flow rate (MFR 2), measured according to ISO 1133 at 230 °C and 2.16 kg, in the range from 1.0 to 50.0 g/10 min, wherein the monophasic polypropylene composition comprises: a) 55.0 to 95.0 wt.-%, relative to the total weight of the monophasic polypropylene composition, of a random copolymer of propylene (R-PP) and at least one comonomer selected from ethylene and C 4 to C 8 alpha olefins, having a melt flow rate (MFR 2), measured according to ISO 1133 at 230 °C and 2.16 kg, in the range from 1.0 to 30.0 g/10 min, a comonomer content, as determined by quantitative 13 C-NMR spectroscopy, in the range from 0.5 to 6.0 mol-%, and a content of 2,1-regiodefects as determined by 13 C-NMR spectroscopy in the range from 0.1 to 1.4 mol-%; and b) 5.0 to 45.0 wt.-%, relative to the total weight of the monophasic polypropylene composition, of a propylene homopolymer composition (H-PP), comprising a reactor blend of a propylene homopolymer and a polymeric nucleating agent that is present in an amount in the range from 20 to 300 wt-ppm, relative to the total weight of the propylene homopolymer composition (H-PP), wherein the propylene homopolymer composition (H-PP) has a melt flow rate (MFR 2), measured according to ISO 1133 at 230 °C and 2.16 kg, in the range from 10 to 100 g/10 min and is free from 2,1-regiodefects as determined by 13 C-NMR spectroscopy; wherein the combined weight of the random copolymer of propylene (R-PP) and the propylene homopolymer composition (H-PP) is at least 95 wt.-%, relative to the total weight of the monophasic polypropylene composition, and the polymeric nucleating agent comprises a monomer of the general formula H 2 C=CH-CHR 1 R 2 wherein R 1 and R 2 are either individual alkyl groups with one or more carbon atoms or form an optionally substituted saturated, unsaturated or aromatic ring or a fused ring system containing 4 to 20 carbon atoms, whereby in case R 1 and R 2 form an aromatic ring, the hydrogen atom of the -CHR 1 R 2 moiety is not present. a) 55.0 to 95.0 wt.-%, relative to the total weight of the monophasic polypropylene composition, of a random copolymer of propylene (R-PP) and at least one comonomer selected from ethylene and C 4 to C 8 alpha olefins, having a melt flow rate (MFR 2), measured according to ISO 1133 at 230 °C and 2.16 kg, in the range from 1.0 to 30.0 g/10 min, a comonomer content, as determined by quantitative 13 C-NMR spectroscopy, in the range from 0.5 to 6.0 mol-%, and a content of 2,1-regiodefects as determined by 13 C-NMR spectroscopy in the range from 0.1 to 1.4 mol-%; and b) 5.0 to 45.0 wt.-%, relative to the total weight of the monophasic polypropylene composition, of a propylene homopolymer composition (H-PP), comprising a reactor blend of a propylene homopolymer and a polymeric nucleating agent that is present in an amount in the range from 20 to 300 wt-ppm, relative to the total weight of the propylene homopolymer composition (H-PP), wherein the propylene homopolymer composition (H-PP) has a melt flow rate (MFR 2), measured according to ISO 1133 at 230 °C and 2.16 kg, in the range from 10 to 100 g/10 min and is free from 2,1-regiodefects as determined by 13 C-NMR spectroscopy; wherein the combined weight of the random copolymer of propylene (R-PP) and the propylene homopolymer composition (H-PP) is at least 95 wt.-%, relative to the total weight of the monophasic polypropylene composition, and the polymeric nucleating agent comprises a monomer of the general formula H 2 C=CH-CHR 1 R 2 wherein R 1 and R 2 are either individual alkyl groups with one or more carbon atoms or form an optionally substituted saturated, unsaturated or aromatic ring or a fused ring system containing 4 to 20 carbon atoms, whereby in case R 1 and R 2 form an aromatic ring, the hydrogen atom of the -CHR 1 R 2 moiety is not present.