This is the thickest and heaviest interlock fabric among the activewear line. It is dense and, as it contains span, it has excellent elasticity and a good feel. It is suitable for sportswear such as winter leggings.

Spandex is mainly made of polyurethane, which has about 3 times the strength and lighter than conventional rubber bands. It can be stretched 5~8 times longer than its original length and it also maintains its original shape as well. It is used for activewear clothing and this fabric contains about 19.2%.