The eyelets on a cap or hat are small, reinforced holes typically located around the crown. Their primary function is to provide ventilation, allowing air to circulate and helping to keep the wearer's head cool and comfortable. Eyelets can be made from metal or stitched holes and are often evenly spaced for balanced airflow. In addition to their practical benefits, eyelets can also be customized in color and material to enhance the cap's overall design and aesthetic appeal.
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