Foamed polyolefin composition

A foamed polyolefin composition comprising (all percent amounts being by weight): A) 50%-90% of a polypropylene component; and B) 10%-50% of a copolymer component of ethylene and at least one C3-C10 alpha-olefin, the copolymer containing from 15% to 50% of ethylene, and optionally minor amounts of a diene; the said amounts of (A) and (B) being referred to the total weight of (A) and (B); said composition having at least one of the following features i) and ii), or both: i) a Polydispersity Index of component (A) of 4 or more; ii) a value of viscosity [eta] of the fraction soluble in xylene at room temperature equal to or higher than 3.5 dl/g.