I have hunted Zim 3 times, a 21 day hunt, a 30 day and a 35 day. All hunts involved a lot of walking.

I have used Russell PH's.
I have 2 pair, one all leather and one canvas and leather.

They have been very comfortable.

The all leather pair were treated with Filson "boot juice" and have never leaked. On my first trip we walked in rivers quite a bit, on my second it rained quite a bit. Never leaked.