Abstract: A propylene polymer composition comprising the following components: a) from 50% to 90% by weight of a propylene homopolymer or a propylene copolymer containing up to 5% by mol of derived units of C2-C20 alpha-olefins, having the following features: (i) a polydispersity index PI>3; (ii) melt flow rate (MFR), as measured at 230° C. under a load of 2.16 kg, MFR>1 dg/min; and (iii) fraction soluble in xylene at 25° C. (XSRT)>1% b) from 5% to 25% by weight a copolymer of ethylene and one or more derived units of C4-C20 alpha-olefins having the following features: (i) content of ethylene derived units higher than 50% by mol and lower than 92% by mol; (ii) intrinsic viscosity (IV) higher than 1.2 dLq and lower than 6 dL/g; (iii) density ranging from 0.850 to 0.