Use your measuring tape to measure the elastic so it is the circumference of your wrist plus 2-3 inches.
I have a fairly small wrist so I measured out 9.5 or 10 inches. It doesn't have to be perfect. The first on I made was tiny so I learned by trial and error!
Wrap it around your wrist and make the ends match up. Then take it off your wrist, wrap around a finger and fold ends around each other. This is your knot.
This is what the knot should look like.
Now take your match and light it. I did it over the sink so I could easily put out the match when done.
Hold the ends of the hair tie Over the match. Don't light the hair tie on fire!
You just want to slightly meld the ends do that they don't fray over time.
And there you go!
It fits comfortably on my wrist!
I made five or so white ones because that is the only color I had. I encourage you to use any color! Pink, brown, green, purple, gold, even sparkles! I wonder if they make lace elastic.....
They are great hair ties!