4pc Sack Thread 100%polyester.

Polyester sack sewing thread is a synthetic all purpose thread. it is a good choice for most machine and sewing projects. polyester threads works well with stretch fabrics as it has much give to it. because of the wax or silicone finish that often covers this thread, it slips through the fabric easily. for the  vast majority of sewing threads the holes in the spinneret are circular, but for high lustre filaments used to manufacture embroidery threads the spinneret profile is triangle producing trilobal filaments.