These replace a pair of "insulated" Bass brand (NOT Bass-Pro) w/ rubber-lowers I've had for years, and I never could find any insulative qualities in them at all.  I kept them only because they kept out the moisture, and that has now failed, hence, the Bugaboot is now mine.  I've worn them only twice, since the NV winter is just really starting in mid-Dec, 2012.  I do not like ordering boots on-Line because of size differences by manufacturers, and these are a little loose.  However, a thicker sock can take that up.  I have chronically cold feet and have worn boots rated to -40F and still had cold toes until I had walked a good distance or worked a while.  Sure enough, the toes were cold wearing the Bugaboot, BUT I was outside only a short while.  The boot is stiff, but I expect them to relax with wear.  These are of high quality construction, and I can at least tell there is insulation in them.  I have a good feeling about this purchase.