Kevlar thread offers many benefits. It is twice as strong as polyester or nylon threads and has little or no stretch, which helps hold a very tight seam. It is used in applications where high-heat esistance is needed and where strength is an added plus. Some applications of Kevlar thread are fire suits, racing gear, tactical gear, mattresses, and much more. Natural color. 65 yd. (59.4 m) spool.