The invention is an article of manufacture, comprising a blend of: (A) from 1 to 50 weight percent of at least one block copolymer, wherein the block copolymer has at least one polystyrene block and at least one unsaturated rubber segment; and (B) from 99 to 50 weight percent of a natural oil. The natural oil of this invention is of natural animal, plant or vegetable oils or mixtures thereof, and the block copolymers have a polystyrene block and a rubber block where the rubber blocks are unsaturated rubbers such as polyisoprene, polybutadiene, or mixtures thereof. The block copolymers useful for the present invention are triblock polymers, radial (star) polymers, multiblock polymers, diblock polymers, or mixtures thereof.