Spandex

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++Span·dex /ˈspændeks/ noun [uncountable] trademark  a material that stretches, used especially for making tight-fitting sports clothes 氨纶〔一种有弹性的材料，尤用于制作紧身运动服〕

Examples from the Corpus

Spandex• He said Nicole Simpson did not own the gold Spandex leotard described by the clinic employee.• The leotard she wore was a pale yellow Spandex, defining the wide shoulders and lean hips of a gymnast.

Span·dex nounChineseSyllable  

used that for a material Corpus especially stretches,

Spandex
Span‧dex /ˈspændeks/ noun [uncountable] trademark
a material that stretches, used especially for making tight-fitting sports clothes

span·dexBrE /ˈspændeks/ 🔊NAmE /ˈspændeks/ 🔊 noun = Lycra™