I keep telling myself that I'm going to switch over to neos for the winter, but if I'm doing a lot of hiking I'd still run my G3 stockingfoots (Which aren't breathable btw, I dunno who came up with that, lol!)
I find if I'm moving around a lot during the day I'm fine... If I'm fishing 1 or 2 holes and I'm spending a lot of time not moving, I just deal with the frozen blocks (aka my feet)