https://www.rongduthread.com/products/heavy-duty-nylon-sewing-thread/ Nylon Filament Thread is composed of extra strong nylon thread 6 and nylon 6.6 continuous filament. Besides carrying remarkable tensile strength, the thread is supple and stretchy, which is necessary for sewing mattress, bedding, sofa, leather, sports goods, footwear, denim, jeans and so on.All Rights Reserved