I've combined two approaches to keeping my feet warm this winter. The first is to make sure my body is warm. If you start to feel the cold, your body concentrates its efforts on keeping your vital organs warm, so it gives up on your feet and hands. So I've bought some expensive base layers (
Icebreaker, they're brilliant) and
fleece mid layers which have worked a treat.
For my actual feet, I'm still using my trusty Goretex walking boots, no need for special thermal boots or anything like that. I bought some decent ski socks with merino wool, and underneath those I have some silk stockings. No not the wife's, some Thaw Thermal Silk socks – which do actually look like silk stockings
. The key to the silk is it's brilliant wicking properties. If you sweat on the way to the swim, you'll end up with damp feet and damp = cold. The silk layer wicks any moisture into the outer layer, as well as providing extra warmth for almost no added thickness and comfort next to the skin. (I also have a Thaw silk top which I wear under my Icebreaker base layer)
It's worked so far, I've fished in the snow and not had cold feet. Though on Saturday I'll be out on small boat for 10 hours+ which could be a challenge for my gear!
I had some neoprene wellies last winter but they don't breath and my feet end up soaking wet with sweat from the walk down, no good at all.