a multilayered film exhibiting good transparency , welding resistance , puncture resistance and impact strength having an outer layer selected from the group consisting of : homopolymers of polypropylene , ethylene / propylene copolymers and blends of high density polyethylene and propylene and ethylene block copolymers ; an inner layer of a different composition from the outer layer and selected from the group consisting of ethylene and α - olefin copolymers , and ethylene and α - olefin copolymers blended with low density polyethylene ; and a complex intermediate layer joining the outer layer to the inner layer , the complex intermediate layer having a plurality of sublayers defining an upper nucleus b1 , a core b2 and a lower nucleus b3 , the upper nucleus being a propylene and ethylene copolymer and the lower nucleus being an ethylene copolymer with an ethylene content greater than the upper nucleus .