Note: they may be sized large.  I always take a 9 reg in everything and I had to drop down to a 8.5.

Even the 8.5 seems to have a room in it, especially above your foot.  And there's minimal cushioning under your feet.

I solved these issue by putting insoles from a pair of running shoes and now they seem to fit and feel pretty well.

Seems pretty water resistant, but I'm guessing it'll leak some at the zipper under water.

So, a decent, lightweight, easy on & off boot for the price that may need an insole for better fit and feel.