Sponging removes residual shrinkage, or removal of any distortion in the size of the fabric caused by tension applied during production. The fabric is dampened with steam or water and allowed to dry in a relaxed state. Residual shrinkage (also called relaxation shrinkage) is different than the shrinkage caused by felting, and sponged fabrics are not necessarily shrinkproof.
Textile Links (http://www.textilelinks.com)
