Yarns consist of staple fibers (e.g. cotton, polyester staple) or filaments(e.g. multifilaments, monofilaments). Spun yarns consist of staple fibers, which are held together by twisting the fibers during spinning. Monofilament consists of a single filament yarn, a fiber obtained by continuous spinning. Multifilament yarns consist of slender filaments and a bundle of slender monofilaments. (Bolian multifilaments 0 twist) Twisted yarns are two or more yarns twisted together into one twisted yarn.