Composite polyester textile fibers

Helically crimpable and crimped bicomponent filaments comprising a laterally eccentric assembly of at least two synthetic polyesters. At least one of the components is 2o a partly crystalline polyester in which the chemical repeatunits of its crystalline region are in a non-extended stable conformation that does not exceed ninety percent of the length of the conformation of its fully extended chemical repeat-units and is generally on the inside of the crimp 35 helices formed when the assembly crimps, while at least one other polyester component is partly crystalline and the chemical repeat-units of the crystalline region more closely approach the length of the conformation of its fully extended chemical repeat-units. Yarns, fabrics, and 30 the like produced from these filaments have a wide range of end uses.