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),
where weight is in pounds, and height is in inches. Originally, the numerical constant was called Queteletâs Index. With time, it has become known, more generally, as the Body Mass Index, (abbreviated BMI). The terms Queteletâs Index, Body Mass Index and BMI are interchangeable. Back to Contents; What Parameter Does BMI Represent? BMI correlates with total body fat content, and is used because total body fat is difficult to measure directly.