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),
Pounds : The pound or pound-mass (abbreviations: lb, lbm, lbm, â[1]) is a unit of mass with several definitions. Nowadays, the most common is the international avoirdupois pound which is legally defined as exactly 0.45359237 kilograms. A pound is equal to 16 ounces.