nylon 6 6 nylon 6 12 and the like polyesters polyolefins e g polypropylene polyethylene and the like as well as mixtures and copolymers of the same presently preferred for use as the inelastic control filament are polyester filaments such as those commercially available from unifi inc in 1 70 34 stretch textured polyester or 1 70 34 in set textured polyester the relative denier of the elastic performance filament 12 and the inelastic control filament 14 may be substantially the same or substantially different in this regard the denier of the elastic performance filament 12 may vary widely from about 10 to about 140 preferably between about 40 to about 70 after the proper draft ratio is applied the denier of the elastic filament inside a tensioned yarn would be about 5 to 70 preferably between 10 and 25 the denier of the inelastic control filament 14 may vary widely from about 40 to about 150 preferably between about 70 to about 140 in one particularly preferred embodiment of the invention the denier of the elastic performance filament 12 and the inelastic control filament 14 is each about 70 as noted briefly above the fibrous sheath 10 2 is formed from a relatively dense mass of randomly.