What is it? What do those names really mean?
Lyrca® – “The registered trademark owned by the Dupont Company for spandex filament yarn.
Spandex- “A generic fiber category that has been define by the federal trade commission as “a manufactured fiber in which the fiber forming substance is a long chain synthetic polymer composed of at least 85% of a segmented polyurethane.”
Spandex Characteristics include excellent elongation and elastic recovery similar to that of rubber. The flexibility, abrasion resistance, strength, and resistance to deterioration by body oils and perspiration are better than rubber. Although spandex can be made as an uncovered filament the fiber always is used in conjunction with other fibers, most often in covered or core-spun yarns where the spandex is covered by other fibers. ”
Simply put, Lycra® is a type of spandex. It’s a brand name.