Many people using paracord to lace their boots, but I was unable to understand why it work. All my attempts to use paracord to lace was failed. I needed to tie knots each 200 meters. That made me crazy. I started to look for the solution and found that ther is well-known double slipknot tat is more efficient and could be used with any nylon lace. So it looks like here:
You could find how to tie it here. I tried it and it is perfect - the knot is never unties now.
The site where I found this knot is really interested - I found a lot of lacing variants here, say you could lace your boots like hexagram and much more:
