Spandex is a manufactured elastomeric fiber in which the fiber-forming substance is a long chain synthetic polymer comprising at least 85% of segmented polyurethane. It is capable of being stretched over 7 times its length and returning immediately to its relaxed state upon release of tension. Spandex may be described as being molecularly composed of a chain-like arrangement of soft, stretchable segments of polyurethane linked together for reinforcement by hard segments. There are two members of the spandex group - the polyester segmented and the polyether segmented. The polyester spandex fibers are more resistant to oxidation and oil absorption. Polyether spandex