These are 100% cotton hats and will shrink. We add to the size of the hat to allow for shrinkage. So therefore order your correct size compared to your head measurements.
Only try this with (1)ONE of the hats. This hat will be returnable.
If the hat fits correctly, wash in warm water and lay flat to dry.
If it is a little too big, wash in hot water and lay flat to dry.
If it is still too big, wash in warm water and dry.
Let us know if this does not work.