 Recent studies have shown that composite yarns made from multiple components are increasingly popular in both weaving and knitting industries. This study compares the structure and properties of plain, elastane cord and elastane plus filament cord composite yarn spun using cotton as sheath fibers. The results show that while the strength of the composite yarns decreased, their elongation values at breaking tended to increase. There was some improvement in terms of yarn hairiness but deterioration in unevenness and yarn defects when transitioning from plain yarn to dual cord composite yarn. Surface and cross-sectional images were studied to understand the causes of these issues. This article was authored by Ilmaz Erbil, Ray Arjal Islam, Osman Babaslan and others.