The band has just the right length for me. When it arrived I knew only not how I would mount it on the glasses, but thanks to my clever sister (Thank you dear Kiki) sorted it out then. Simply push back the small wire spirals to the loops, push loops on the ends of the temples, and then the wire spirals again push back until they engage.
System, I hope it keeps for a long time (even though I have three cords) :-)