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Most elastics are made from a rubber core yarn covered with cotton, synthetic or a blend of fibres. They may occur as a single yarn or as several yarns braided or woven together.
Single yarn elastics can be used for hat bands, loop closings or as elastic thread for shirring; most elastics, however, fall into either the braided or the woven categories.
Braided elastics can be identified by the lengthwise, parallel ridges that give these elastics a stronger grip. Because of its structure, braid narrows when stretched, and is recommended for casings rather than for stitching to the garment itself.
Woven elastics are usually softer; the woven construction enables them to maintain their original width when stretched. Wovens curl less than braided elastics, and so can be stitched to a garment more easily.
Elastics are made and sold for special purposes, such as pyjamas, lingerie, bra closures, etc. There are many new elastic products, such as wide, colourful woven designs that service as waistbands for skirts or pants, and elasticated products for waistbands or belts.
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