An article from Master Weaver (No. 34, July 1957) that sorts weaving yarns into natural, processed, synthetic and mixed fibers. It explains why synthetic yarns exist and then reviews the properties of rayon types, nylon, Vinyon, Saran, Orlon, Terylene, Perlon, polythene and glass fiber from a handweaver's viewpoint. The scan opens with the end of a piece on texture effects in pattern weaving and closes with the start of an article on velvet rugs.