Joker, high tenacity corespun sewing thread, is produced by wrapping natural cotton fiber over polyester filament. This wrapped cotton protects the high tenacity polyester filament core f rom the high heat of needle and iron. Polyester core with strength allows getting a perfect seam appearance with finer thread sizes on soft fabrics. It is resistant to heavy chemicals and after the denim washing process, it provides matching natural colour stitches with denim.