Join Date: Aug 2004
Location: Climbing, a mountain, Canada.
Interest: climbing and spraying
I know two people who got it just from wearing plastic mountaineering boots for several days straight on a winter mountaineering trip, and one person who got it from wearing VBL socks in regular mountaineering boots at a moderately high elevation (3500-4000m) for three days.
It took one of those three guys THREE WHOLE MONTHS to be able to walk again.
My theory is therefore do do everything short of getting frostbitten feet to make sure I never get trench foot. And since I have sweaty feet at the best of times, that means changing inner socks frequently and never wearing VBL socks, neoprene, Goretex socks or other things that hold moisture against the foot. I don't even like to use boots with Goretex or other membranes in them.
Canyoneering is a bit of a different story since it's different water all the time rather than the same water/sweat recirculating against your skin, but even then I mostly just wear two pairs of regular wool socks and let them get wet instead of wearing neoprene.