Any recommendations? Doesn't have to insulate completely; it needs to repel lots of wind. Another requirement is they would fit in a single jersey pocket, or a small pocket mounted at the bottom of the seat (think Assos arm and leg warmers form factor). I have large neoprene shoe covers, but not what I'm pursuing...since cycling shoes are all made out of mesh, occasional windproof insulation can come in quite handy. I'm almost tempted to sew something together with nylon and such, geared for descending from high altitude at very fast speeds.