Just what I was looking for!  Haven't tested their capability to -25 degrees, but these boots have kept my feet toasty warm and dry in 5 degree, snowy, Michigan weather.  I was looking for a boot that goes on easily and is comfortable to walk in, and this pair definitely fits the bill.  I was concerned about them being difficult to get in and out of, and almost ordered the zip-up pair instead.  No need ... the lace up pair is EZ on-and-off, great for getting out the door in a hurry.  I'm a size 8, and found these boots to be very true to size, although that's with regular socks.  You may want to consider going up a half size if you plan to wear super-heavy winter socks.  Highly recommend these boots!