My regular Desert boots were too big, had to add thick inserts so I ordered the Desert Trek a half size smaller.  Mistake!  They are okay because of the roomy toe box but a subsequent pair of regular desert boots were a little tight, definately not too big like the 1st pair.  Too bad, as this continues to be a problem with ordering on line.  Otherwise, I love these boots.  Too bad Clarks are in my opinion pricey or I would order a pair that fits better.  You'd think as long as they've been at it their sizing would be more consistent.