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Here is a demonstration of professional hat circumference measurement.

Head Circumference Measurement Method: .1. Measuring tool: Soft tape measure. 2. Size unit: Centimeters. 3. Measurement method: Sit or stand, use a soft tape measure to measure from the root of the forehead hair to the next 2CM after the bump on the back of the head, and then add 1-2CM to measure the maximum head circumference horizontally above both ears.