IT IS COMPATIBLE WITH 56/59 CM HEAD SIZES THANKS TO ITS BACK ADJUSTABLE BELT STRUCTURE MAIN FABRIC 100.00% Cotton STORAGE RECOMMENDATION Store in a dry and ventilated place. Thanks to its special component fabric, it is very light and pleasant to wear. Store in a dry and ventilated place. How to Take Head Measurement? When you measure your head circumference 1 cm above your eyebrow, the measurement you find is your head measurement.