The size is manually measured on a flat surface, with an error of 1-2cm, which is within the normal range. Please understand The fabric of the dense mesh long tail hat has a unfolded length of 140cm, a hat length of 70cm, and a net weight of 320g The fabric of the dense mesh short tail hat has a unfolded length of 74cm, a hat length of 36cm, and a net weight of 175g The unfolded length of the thin fishing net fabric is 90cm, the length of the hat is 45cm, and the net weight is 70g Head cover length 55 centimeters, net weight 50g The hat has elasticity and can be stretched horizontally. The head circumference is not limited. For special head circumference, please contact customer service in advance Dense mesh black long tail hat Dense mesh white long tail hat Dense mesh black AB diamond long tail cap Dense mesh white AB diamond long tail cap Dense mesh fluorescent green long tail hat Dense mesh black short tail cap Dense mesh white short tail cap Dense mesh white AB diamond short tail cap Dense mesh black AB diamond short tail cap Dense mesh fluorescent green short tail cap Head cover