Abstract: The disclosure relates to headwear, the headwear including a hat body and a size adjustment mechanism positioned along a flap in an interior of the hat body, where the size adjustment mechanism includes a cord extending along a first side of the flap and having a first end fixedly attached to the interior of the hat body and a second end removably attachable to a second side of the flap via a fastener. The headwear is lightweight, devoid of any rigid or bulky components and is configured to bend or flex at any portion of the headwear without permanently deforming the headwear.

Abstract: The disclosure relates to headwear, the headwear including a crown and a size adjusting mechanism including a crown slit comprising a first terminal crown edge and a second terminal crown edge and extending continuously from a slit termination site of the crown through a bottom circumferential edge of the crown, where the first terminal crown edge and the second terminal crown edge are configured to overlap by a greater or lesser extent as a size of the crown is adjusted via the size adjusting mechanism.

Abstract: The disclosure relates to headwear, an example headwear including a crown and two or more overlapping panels in a rear of the crown, the overlapping panels being moveable relative to one another as a size of the crown is adjusted.