GADIEMKENSD UPF50+ Folding Outdoor Hat Unstructured Reflective Design Breathable Soft Sport Hats

My head size is 21inch and often have to go for a child size. How adjustable is it? Is there a child size version?

Will it fit my big head which has a circumference of 59/60cm without looking odd when worn?

Is the irem washable?

Have a problem with caps going over my ears, does this cap sit high? Also is it breathable for running?