Mettler Seraflex Thread: 50 wt- 142 yds- #1067- Dark Current

Made of: Polytrimethylenterephthalat (PTT) "Perfect sewing thread for highly elastic seams. Primarily used for clothing, such as sportswear, outdoor, lingerie and underwear.” (per manufacturer) "Due to its innovative raw material PTT (37% renewable raw material) an elongation of approx. 65% is achieved, making all seams highly elastic. SERAFLEX makes especially the straight stitch extremely stretchable, in the best case even a doubling of the seam elasticity can be achieved compared to seams with conventional sewing threads” (per manufacturer) Instructions for use: SERAFLEX should be used as both, needle and bobbin thread. Thread tension should only be “as tight as necessary”, meaning as loose as possible. The bobbin thread should also be wound with as little thread tension as possible to prevent the thread from stretching beforehand. The sewing thread is suitable for the sewing machine.