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),
A pound or pound-mass (abbreviations: lb, lbm, lbm or â) is a unit of mass used mainly in the imperial and United States customary. The most common definition today is the international avoirdupois pound which defined as exactly 0.45359237 kilograms, and which is divided into 16 avoirdupois ounces.