Mat Malone wrote an answer about Asolo TPS 520 GV Boot - Men's on July 30, 2012
You may be able to get by. But there is no substitute for real insulation. I've worn them for a few hours while post-holing around in crusty, knee-deep snow (feet mostly submerged in snow) on a 25 degree F day. Just barely warm enough. I would have definitely appreciated legitimate winter boots.