J.VERMen's Cotton Linen Short Sleeve Shirts Casual Lightweight Button Down Shirts Vacation Beach Summer Tops with Pocket

What is the neck size for the XL please

If it shrinks can it be returned?

The discription say machine was and hand wash which is it?

Can someone explain the "Anti-shrink treatment"? Is that a spray or has it been pre-shrunk? I am concerned it will shrink in the wash.