Embodiments of the present invention relate to sizing compositions, glass fibers, and fabrics. For example, some embodiments provide a composition that includes: (a) a cooked starch comprising fluid-swollen starch particles and (b) a film forming polymer. The film forming polymer, in some embodiments, has a glass transition temperature from about −50° C. to about 150° C. The fluid-swollen starch particles, in some embodiments, exhibit a granular swelling power (GSP) from about 1 to about 20.