Final answer:
The boonie hat features an adjustable drawstring that allows secure fitting, brim adjustment for visibility and camouflage, and the ability to hang the hat on the neck when not needed.
Step-by-step explanation:
The "boonie" hat, also known as a bush hat or giggle hat, typically includes a wide brim and an adjustable drawstring. This drawstring offers several options for the wearer. First, it can be adjusted to ensure the hat fits securely on the head, especially in windy conditions. Secondly, the drawstring can be used to lift the brim up on one side for better visibility or to secure foliage for camouflage. Finally, the drawstring can often be used to hang the hat on the back of the neck when not in use. The various utility aspects of the boonie hat make it a favorite amongst military personnel, hikers, and outdoors enthusiasts.