Core-spun typically use the high strength low stretch low shrinkage of polyester filament as raw material. Outsourcing cotton polyester staple fiber type of call Poly-Poly, polyester English expression methods for: POLY - POLY. Poly poly is a versatile sewing thread, used in suits, jackets, shirt, skirt, the swimsuit, underwear and knitting clothing. And applicable to all kinds of process and machinery.