Elastane is the same as Spandex. Both are yarns that are knit/woven into fabrics, and contribute stretch and recovery properties to the fabric. Spandex is DuPontâs brand, elastane is the generic name.
In Latin 'Libra' are the symbol for the scales, hence the use of lb for weight (and lbs for the multiple),
n, pl -weights or -weight. 1. (Units) Also called: long hundredweight Brit a unit of weight equal to 112 pounds or 50.802 35 kilograms. 2. (Units) Also called: short hundredweight US and Canadian a unit of weight equal to 100 pounds or 45.359 24 kilograms.