Originally Posted by
MichaelW
Applying SPD cleats in the usual manner by drilling the sole and using a metal back-plate will compromise your winter boots and put a heat-sink inside.
This is why my
Lake MXZ302s came with an insulated insole, which cures that problem entirely. A popular aftermarket brand is
Toasty Feet. Some silicone sealant will take care of any water leakage.
While I absolutely love mine, I completely understand that not everyone can afford a set of Lakes. A homebrew pair using old hiking boots, Toasty Feet and some silicone sealant may be a perfectly valid alternative.
I'd like to hear how it works out for the OP.