This headband is one size fits most and the size cannot be adjusted. The headband is sewn at a 6" diameter (12" 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 faux-fur pom measures approximately 3" across. This style is secured with hand stitching and the pom is not meant to be removed. The headband material is a soft nylon, produced to our specifications, in the USA. The faux-fur pom is sourced in China. Each headband is hand sewn and assembled by women in our local community. Due to the nature of small-batch production, color and sizing can vary slightly.