It is a very simple headband design that has been embellished with a DNA strand created from a combination of a crochet chain and embroidery stitches. (thespruce.com)
Keep in mind that the more simple your headband is, the more versatile it will be. (makeoverly.com)
The simple headband is adjustable and thick enough to sit comfortably in place. (geekwrapped.com)