This headband is one size fits most and the size cannot be adjusted. The headband is sewn at a 7" diameter (14" circumference), keep in mind that measurement is before it stretches. Due to the type of fabric, this bow does have a more limited stretch compared to our other styles. The bow measures approximately 4.5" across. The Splash KNOT¬†headband is 4" wide. The edges of the headband are raw and intended to roll. The headband is sewn in 2 pieces and the bow can be untied to remove or mix-and-match. The Splash KNOT material is a soft nylon/spandex blend sourced 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.