Measure with a tape measure around your head, where the hat would rest; in the middle of the forehead and at the level of the bump at the back of the skull. About 2/3 cm above  ears.

Very important, be careful not to overtighten the meter, that you are comfortable, as you would like your hat to be.

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For felt hats, if  you are between two sizes, I strongly advise you to take the larger one. Wearing a hat will be more comfortable and it will be easier to reduce one size instead que de enlarge it.

For straw hats, take your usual size.

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