“…Makinson [5,6] reviewed different mechanisms of felting and shrinkage of wool and wool fabrics and concluded that "Felting is the process of progressive entanglement of the fibers in an assembly, occurring as a direct result of agitation by undirected external forces." There are a number of fiber properties involved in felting [6,8,[11][12][13], the important ones being the original state of fibers in an assembly (i.e. loose wool, yarn, and fabric), surface friction, fiber diameter, fiber length, elasticity, the flexural and bending rigidity of fiber (or the magnitude of the fiber deformations), crimp or compressibility, and a series of alternate elongations and contractions of fiber or fabric etc.…”