Below -20F!!! Do you actually tour in those conditions? I could see myself getting stuck with those conditions on an XC ski or snowshoe tour, but if I experienced -20F on a bike tour, I'd be looking for a room to wait for warmer weather.What's the best shoe cover for riding in cold weather?
Probably whatever the other guy is wearing.
I have neoprene booties. They achieve nothing except some water protection. If you need to keep your toesies warm in sub-20F, you must have adequate insualtion and you must add heat. Even pedaling at a nice clip (risking wind chill on the exposed bits) you cannot get enough warm blood into your toes to keep you comfortable for long.
At home I wouldn't dream of riding in -20F, I would hike, trail run, snowshoe, or XC ski, but riding a bike in those conditions wouldn't even occur to me.
My hat is off to any braves souls who would tour in -20F or lower.
I'm guessing his "sub-20F" quote is really below 20F. The "-" is just in there to separate the sub from the 20F. I really doubt anyone bikes in minus 20F temperatures, no matter what they might say.
I use neoprene booties. Plus Lake mountain bike winter boot shoes. And wool socks. This combination is OK for an hour down to about 15-20F. After an hour, my toes are cold. In the mid 30s F, road shoes and neoprene booties and wool socks work for about 2 hours.
I've heard good comments about those chemical heaters that you activate and then put on top of your shoe toebox inside neoprene booties. Not tried them yet.