Cotton Underthread
Superior Masterpiece is an extra long staple, Egyptian grown, 50/2 cotton underthread.
As an underthread Quilters love it as it keeps the fibre content consistent with the fabric, batting, and top thread. Not such a favorite of the embroiderers, it is OK, but on dense fill designs, cotton bobbin thread will result in a stiff design.
It is very important that you choose a good quality cotton for the bobbin. The lower quality cottons will produce more lint which in turn requires more frequent machine cleaning. A good quality cotton will produce little lint and less machine downtime.
Masterpiece is also a fantastic top thread,
Click here for more details for masterpiece on top.