One size fits all:
I carry with hats Gr. 56/57 (M) and this hat sits me very loose. People with a smaller head, he sits on the ears. For "stubborn" it is probably perfect. ;-)
Cleaning:
no idea, according to label everything (washing, spinning, drying, ironing, chemical ...) prohibited. Will probably only wear in the rain or showers with hat ;-)
Conclusion:
a very nice with a Panama hat in my opinion good value for money. I would buy it again.
