These looked great online and I went with the reviews that they were comfortable despite the heel height when I ordered.  I have another pair of Timberland Earthkeepers I love, but these did not work for me.  The heel was way too high, making the boot over the top of the foot very tight and uncomfortable.  Plus they go up about 2/3 of the way up your shin (for me at 5'8"), definitely nowhere near being knee high.