from at least one of propylene, ethylene, and 4-methylpentene-1, said polyolefin having a Vicat Softening Temperature of above 120??? C. (as determined according to ASTM D1525); and (b) at least one second layer consisting essentially of a polyolefin derived principally from at least one of propylene, ethylene, and 4-methylpentene-1, and being of semi-crystalline characteristic to exhibit low per