Apparently, my right foot is larger than my left, therefore tighter. Other than that, great work boots.
UPDATE: I've had this boots since June, 2010 and it's still a good pair of boots.
So far, the tips of the boots had worn a hole due to lots of kneeling I do while working but, unlike may others I bought for work, the soles are still intact and no other unusual wears or defects.
I'm looking to buy another soon to replace the one I got now.