This invention relates to a molded article comprising a heterogeneous blend that includes: 1) from 60 to 99 weight percent of one or more semi-crystalline propylene homopolymers or copolymers having a melting point between 100 and 170 .degree. C. and a melt flow rate of 200 dg/min or less; and 2) from 1 to 40 weight % of one or more semi-amorphous propylene /C.sub.2 and/or C.sub.4 to C.sub.10 .alpha.-olefin copolymers each having a particular heat of fusion, a melt flow rate, intermolecular compositional distribution as determined by thermal fractionation in hexane, Mw/Mn, and propylene triad tacticity such that the molded part formed from the resulting blend has improved notched impact strength, flexibility, elongation, and resistance to stress whitening at a thickness of from 250 .mu.pm to 10 mm.