A heterophasic polypropylene copolymer having an MFR2 of 0.05 to 20 g/10min (ISO 1133 at 230°C with a loading of 2.16 kg) and a melting point (Tm) of 156 to 164°C (measured by DSC according to ISO 11357) wherein the heterophasic polypropylene copolymer comprises at least the following components: (A) 55.0 to 95.0 wt% of a crystalline fraction (CF) having a comonomer content of 0 to 3.0 wt%; and (B) 5.0 to 45.0 wt% of a soluble fraction (SF) having a comonomer content of 12 to 45 wt%; wherein the intrinsic viscosity (IV) (in decalin at 135°C) of the soluble fraction (SF) is 2.5 to 11 dl/g, and wherein the amount of crystalline fraction (CF) and the amount of soluble fraction (SF) are determined in 1,2,4-trichlorobenzene at 40°C.