iHUFeather 5 Pack Wide Brim Straw Panama Hat Fedora Summer 。Woven Straw Panama Hat with Feather Detail Handmade Hat, Summer Hat, Beach Hat, Boho, Beach, Music, Sun, Feathers, Southwestern All hats are measured on the interior circumference. Hat size is based on the circumference of the head. For more information on how to determine your hat size check out my about me Sizing Reference Glass Mannequin Head is approximately 22 inches I created Plasma Beams to support my dream of being an INDEPENDENT designer and entrepreneur! Check out my boutique stocked with one-of-a-kind items for all of your fabulous UPCYCLED FASHION needs! *Follow @plasmabeamz L1-1381 QQQ12