I am a Union Electrician that wears work boots all day every day.  Ecco boots are bar-none the best work boots out there.  They have no break in period, they fit like a glove, and have a wonderful sole.  That being said, the Track 5's alone have this awful stretchy sock like piece inside that make putting the boot on a real chore.  It is fastened to the tongue, and also to the inside of the boot deep inside.  Once on, you don't notice the "sock" piece at all.  While it maybe what helps these boots fit so well, it is a daily hassle.  I have loved every pair of Ecco boots I have ever had, but I would not buy the Track 5 again for this reason.  The catch is, this is really the only boot Ecco makes without some kind of seam across the toe. No big deal for some, but as any electrician can attest to, any one who works on their knees at work will eventually shred that toe stitching and the boot will fall apart.  Untill they go away from that liner thing, I would not recommend or purchese these boots again.