Abstract: The research was conducted to assess the effect of different contents of elastane, at different twist multipliers by feeding single and double roving upon 14s elastic core cotton covered yarn quality, was initiated in Department of Fiber Technology, University of Agriculture, Faisalabad in coordination with Nafees Cotton Mills LTD., Muzaffargarh, Ayub Agriculture Institute, Faisalabad and Crescent Textile Mills LTD., Faisalabad. Different parameters and their interactions exerted highly significant effect upon elastic core yarn properties.