Also known as polypropylene. It is used for molded items, sheets, films and fibers. Made from a by-product of gasoline refining, olefin has one ingredient: propylene. Since propylene is widely available at a comparatively lower cost than nylon base ingredients, olefin is less expensive than nylon. Olefin does not accept aqueous-based dyes or stains. Color is added in the manufacturing process in the form of pigment. Printable modifications are available but not extensively used. Olefin is a lightweight fiber and can have good bulk and cover. However, the polymer base creates a soft fiber which has poor resiliency, a lower melting point and poor texture retention as compared to nylon. The carpet fiber is available as bulked continuous filament yarn. Only when budget is the main consideration, lower life expectancy is anticipated, and long-term appearance retention is not a priority, olefin can be considered.