ROCKY S2V Predator Military Boot

I wear nike sfb’s in an 8.5, what would be the best size to order for these. recently ordered bellville min-mil at an 8.5 and they didn’t fit well.

How much does a pair of these boots weigh?

Why would size 12.5 be 40 dollars more than size 12?

What is the return policy on these boots? May have purchased the wrong size.