Spandex covered yarn is spandex core-spun yarn. Spandex has good elasticity but poor abrasion resistance, so when used, spandex is used as the core yarn, and other types of fibers are spun into core yarn or wrapping yarn. Other fibers can be cotton, chemical fiber, etc. Cotton yarn is divided into coarse special (number) yarn, medium special (number) yarn, fine holding (number) yarn and super fine holding (number) yarn.
Coarse special yarn: refers to yarn with a linear density of 32 tex or more.
Mid-special yarn: refers to yarn with a linear density of 31-21 tex.
Fine special yarn: refers to yarn with a linear density of 11-20 tex or more,
Extra-fine special yarn: refers to yarn with a linear density of 10 tex and below.