In this study, thirty-six cultivars of U.S. upland cotton are selected and their wax content determined by the Conrad method. Both ring spun and open-end yams are then made from these cottons. Various fiber and yam proper-ties are measured before and after wax removal using AFIS, HVI, the West Point cohesion tester, and the Uster Tensorapid yam tensile tester. Correlations of wax content with fiber properties and yarn properties are analyzed.