Polyamide 66 Threads are made up of macromolecules with repeating units liked together by much stronger amid bonds (Chemical Bonds), other threads are held together by ester bonds.
These threads show more high elasticity than other threads that are more commonly available in the market. They are more suitable to sew curved shaped pieces of leather, vinyl or fabric without any signs of ungainly puckering and corrugations at the seams.