1. An elastic buckle behind sun hats is for adjusting to fit your head size. The ponytail hole is specially designed for women. 2. Adjustable chin strap can effectively hold the hat in place on windy days. Mesh vents on both sides keep your head cool and breathable. 3. It is packable, crushable and flexible without losing its shape, so a floppy bucket hat can be easily carried inside your handbag and save lots of space. Perfect outside gifts for your girlfriend, wife, mother, and sister.