A short 1929 trade article on the use of rayon in necktie fabrics. It explains that cuprammonium rayon has improved enough in strength, elasticity and fineness to be used as warp as well as filling, and compares its filament diameter and denier with weighted silk. It discusses the molecular structure shown by X-ray diffraction patterns, the need to avoid long floats so yarns do not shift, and two sample fabrics woven from Bemberg cupra-ammonium yarn.