MerrellMen's Moab 3 Mid GTX Hiking Boot

Are these boots truly waterproof, customer comments indicate they are not waterproof?

How breathable are these boots? I have another brand of waterproof boots and my feet sweat so much they get wet, wrinkly, and smelly by day's end.

What is the difference between size 9.5 and 9.5 wide boots?

Why do prices vary so much by size? The size I wear is $41 more than a half size smaller and $45 more than a full size larger.