RE:Simms breathable waders
I have the bootfoot Simms Goretex and love them. Done a lot of walking and wading in them - winter and summer - the last two years on Puget Sounds assorted steelhead rivers. They're great waders with just about the best boots (comfort, ankle support, etc) I've found on a bootfoot wader!
The $$$ tag is steep, but you'll appreciate your investment every time you put them on.