I wear my Sorel boot liners only w/o the boots and carry walking shoes
in the glider. The felt is flexible enough to not hinder pedal
operation. I change out of my shoes just before entering the glider.
Inside the Sorel liners I use the foot warmers called Thermal Soles
($100US). Lithium battery shoe soles that maintain 98F so you never
get overheated. Only about 8mm thick at the heal and 3 everywhere
else. Very well made and last 8+ hours. This combo works excellent. I
plan to try the warmers in normal shoes instead of the felts. You
just missed the window to put these on your holiday gift list. ~Bruce