These headbands are one size fits most and the size cannot be adjusted. The headband is approximately 6" in 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 she grows into childhood. The bow measures approximately 2" across. The edges of the headband and bow are raw and are meant to roll. This style is not meant to be untied. The material is a soft nylon/spandex blend produced in China. Each headband is hand sewn and tied. Due to the nature of small-batch production color and sizing can vary slightly.