This headband is one size fits most and the size cannot be adjusted. The bow measures approximately 4.5" across. The Skinny FAB headband is made from our signature skinny nylon. All edges of this style are raw and are intended to roll. This style is secured with adhesive once tied and is not meant to be untied. The FAB material is a soft nylon/spandex blend produced in China. Each headband is hand sewn and tied by women in our local community. Due to the nature of small-batch production color and sizing can vary slightly.