This headband is one size fits most and the size cannot be adjusted. The bow measures approximately 4.5" across. The FAB SKINNY headband is made from 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. Each headband is hand sewn and tied. Due to the nature of small-batch production color and sizing can vary slightly.