TRULOCK Fleecy Nylon is a soft textured nylon yarn for your serger that performs well with stretch fabrics like lycra or jersey, and also gives excellent coverage to seams and rolled edges. It's soft enough for clothing - lingerie and baby clothes - on your skin and tough enough to perform with today's high-speed household overlockers. Use in the looper on the top or bottom of the serger. A 90/14 size needle is recommended for this sewing thread.