Spun silk is a form of cheaper silk thread. Normally one or more silk filaments are reeled directly from a silk worm cocoon and then used either in the form of floss silk, whereby the (sometimes very long) filaments are not, or very slightly spun, or a number of silk filaments (often comparatively short) are spun in order to make a usable thread. A spun silk thread is normally much cheaper than the unspun (floss) version.