Bonnets get a bad rap because people think they're a baby thing, something the Amish wear, or are just plain dorky, but I think they deserve a chance. A bonnet can just plunk onto your head, it never rides up in back (making biking + bonnets the ideal pairing), and there’s the potential for three (three!) pompoms. But if pompoms aren’t your thing, feel free to skip them.
One size, 17.5" from ear to ear and 10" from the front edge to the hat apex.