POM London Crochet Flapper / Cloche Hat with Flower Corsage : Brown 100% Acrylic Detachable Flower corsage One size fits all, stretchable (will fit 22"/ 56cm head up to 24"/61cm head) Yarn : 100% Acrylic How to measure your size. Using a tape measure, measure the widest part of your head, just above your ears and eyebrows