Olefin is the generic name for polypropylene, a synthetic fiber used to make many different products, including carpet. In the carpet industry, the terms olefin and polypropylene are typically used interchangeably, as they both mean the same thing. Olefin is valued in the carpeting industry for its wool-like appearance. For this reason, it is often used in looped berber styles and in area rugs, both of which are commonly made from wool. Olefin’s finish can range from low lustre (matte) to a high sheen. Because it is hydrophobic, olefin is great for both indoor and outdoor use.