A heterophasic polypropylene composition, comprising: i) from 40.0 to 90.0 wt.-%, relative to the total weight of the heterophasic polypropylene composition, of a heterophasic propylene-ethylene copolymer (HECO) having a melt flow rate (MFR 2), determined according to ISO 1133 at 230 °C at a load of 2.16 kg, in the range from 1.0 to 5.0 g/10 min and a melting temperature (T m), determined by differential scanning calorimetry, in the range from 149 to 160 °C, comprising: a) a crystalline matrix being a propylene homopolymer having a content of 2,1-regiodefects as determined by quantitative 13 C-NMR spectroscopy in the range from 0.05 to 1.40 mol-%; and b) an amorphous propylene-ethylene elastomer; wherein the heterophasic propylene-ethylene copolymer (HECO) is characterized in terms of its soluble fraction and crystalline fraction as determined by CRYSTEX QC analysis: i. from 60.0 to 95.0 wt.-%, based on the total weight of the heterophasic propylene-ethylene copolymer (HECO), of a crystalline fraction having an ethylene content C2, as determined by quantitative IR spectroscopy, in the range from 0.0 to 2.0 wt.-%; and ii. from 5.0 to 40.0 wt.-%, based on the total weight of the heterophasic propylene-ethylene copolymer (HECO), of a soluble fraction having an ethylene content C2, as determined by quantitative IR spectroscopy, in the range from 12.0 to 40.0 wt.-%; ii) from 10.0 to 60.0 wt.-%, relative to the total weight of the heterophasic polypropylene composition, of a propylene-butylene random copolymer (RACO), having a melt flow rate (MFR 2), determined according to ISO 1133 at 230 °C at a load of 2.16 kg, in the range from 0.5 to 15.0 g/10 min and a content of 1-butylene, determined by quantitative 13 C-NMR spectroscopic analysis, in the range from 1.0 to 10.0 wt.-%; iii) optionally, from 0.0001 to 1.0 wt.-%, relative to the total weight of the heterophasic polypropylene composition, of a nucleating agent; and iv) optionally, from 0.1 to 5.0 wt.-% of further additives different to the nucleating agent. i) from 40.0 to 90.0 wt.-%, relative to the total weight of the heterophasic polypropylene composition, of a heterophasic propylene-ethylene copolymer (HECO) having a melt flow rate (MFR 2), determined according to ISO 1133 at 230 °C at a load of 2.16 kg, in the range from 1.0 to 5.0 g/10 min and a melting temperature (T m), determined by differential scanning calorimetry, in the range from 149 to 160 °C, comprising: a) a crystalline matrix being a propylene homopolymer having a content of 2,1-regiodefects as determined by quantitative 13 C-NMR spectroscopy in the range from 0.05 to 1.40 mol-%; and b) an amorphous propylene-ethylene elastomer; wherein the heterophasic propylene-ethylene copolymer (HECO) is characterized in terms of its soluble fraction and crystalline fraction as determined by CRYSTEX QC analysis: i. from 60.0 to 95.0 wt.-%, based on the total weight of the heterophasic propylene-ethylene copolymer (HECO), of a crystalline fraction having an ethylene content C2, as determined by quantitative IR spectroscopy, in the range from 0.0 to 2.0 wt.-%; and ii. from 5.0 to 40.0 wt.-%, based on the total weight of the heterophasic propylene-ethylene copolymer (HECO), of a soluble fraction having an ethylene content C2, as determined by quantitative IR spectroscopy, in the range from 12.0 to 40.0 wt.-%; a) a crystalline matrix being a propylene homopolymer having a content of 2,1-regiodefects as determined by quantitative 13 C-NMR spectroscopy in the range from 0.05 to 1.40 mol-%; and b) an amorphous propylene-ethylene elastomer; i. from 60.0 to 95.0 wt.-%, based on the total weight of the heterophasic propylene-ethylene copolymer (HECO), of a crystalline fraction having an ethylene content C2, as determined by quantitative IR spectroscopy, in the range from 0.0 to 2.0 wt.-%; and ii. from 5.0 to 40.0 wt.-%, based on the total weight of the heterophasic propylene-ethylene copolymer (HECO), of a soluble fraction having an ethylene content C2, as determined by quantitative IR spectroscopy, in the range from 12.0 to 40.0 wt.-%; ii) from 10.0 to 60.0 wt.-%, relative to the total weight of the heterophasic polypropylene composition, of a propylene-butylene random copolymer (RACO), having a melt flow rate (MFR 2), determined according to ISO 1133 at 230 °C at a load of 2.16 kg, in the range from 0.5 to 15.0 g/10 min and a content of 1-butylene, determined by quantitative 13 C-NMR spectroscopic analysis, in the range from 1.0 to 10.0 wt.-%; iii) optionally, from 0.0001 to 1.0 wt.-%, relative to the total weight of the heterophasic polypropylene composition, of a nucleating agent; and iv) optionally, from 0.1 to 5.0 wt.-% of further additives different to the nucleating agent.