Nothing major. I just thought I would share this to make some sort of contribution to the forum. I used one cord to make the length of strap to fit the user. I then completed a basic cobra knot for the full length. I left it about 1/4" short on each end for freedom of movement. However, this was made 8 years ago, and it appears the user has removed about 1" of cord from each end of the strap. The cobra is flat enough that it's actually very comfortable.