This headband is one size fits most and the size cannot be adjusted. The headband is sewn at a 6.5" diameter (13" circumference), keep in mind that measurement is before it stretches. We feel this is the perfect size for our soft nylon to fit a newborn and stretch comfortably as they grow into childhood. The printed headband material is a soft nylon/spandex blend produced in China. The hat and embellishments are also sourced in China and are affixed to each hat and not meant to be removed. Each headband is hand sewn and embellished by women in our local community. Due to the nature of small-batch production color and sizing can vary slightly.