I bought this shock cord to make boot laces. The shock cord makes it unnecessary to tie knots. A measured length of shock cord is laced through the shoe fastening holes and threaded through a sliding stopper. Put your foot into the shoe, slide the stopper to shorten the lace, and the shoe is fitted tight. Slide the stopper to lengthen the lace, loosen the lace, and you can take your foot out from the shoe. What a convenient mod!