A high flow, low density Ethylene-butene (EB) polyolefin elastomer (POE) designed for use as an impact modifier in TPO formulations. It is designed to enhance the impact performance of, add flexibility to, and increase filler capacity in a variety of polymer compounds, especially TPO compounds. It is especially useful when increasing the low temperature toughness of polypropylene or polyethylene is required. This product is delivered in free flow pellet form.