Foldable Wide Brim Floppy Straw Beach Sun Hat,Summer Cap with Bowknot for Women Girls,Strap Adjustable, Pink, L

Does this hat have any holes for ventilation? breatheable?

Is it water proof?

The description says there is a removable chin strap but when I look at all the pictures I don’t see anything like that. Does it have one?

My head circumference is 21 1/2 " will it fit me ok ? I really love it