Quiksilvermens Bushmaster Sun Protection Floppy Visor Bucket Hat Bucket Hat (pack of 1)

What size would fit someone with 7 7/8 hat size?

my head is about 22 4/5 inchs,can i wear it?

is it water proof?

If i wear a 7 1/4” typical baseball hat, what size should i order for this hat, the l/xl size?