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Elastolefin is a fibre composed of at least 95% (by weight) of macromolecules partially cross-linked, made of ethylene and at least one other olefin. When stretched to one and a half times its original length, it recovers rapidly to its original length. It therefore will stretch up to 50% and recover. Recent updates to EU fabric labelling directive to include elastolefin in Anex I and II.[1][2][3]