Lycra fabric is primarily made from polyurethane, a type of elastic polymer. It is made partially of elastic fibers such as lycra, elastane, spandex (different names of the same synthetic fiber). But in the process of creating the first elastic fabrics, Hancock found himself wasting considerable rubber. 4-way stretch fabrics, such as spandex, stretch in both directions, crosswise and lengthwise. Stretch fabrics are either 2-way stretch or 4-way stretch. Another is a double core twist which uses two non-elastic yarns spun around the elastane filament in opposite directions making the overall yarn stronger and stops the elastane from showing. There are also knit fabrics which stretch due to the production method – looping. Most stretch fabric contains some percentage of elastic fibers twisted into the yarns of the material. Here are the main types of elastic. Elastic is thread, cord, braided or woven ribbon, or fabric that has resilience and flexibility.

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