I have an old pair of Timberland Boat Shoes, size 10 - so I ordered a size 10 in this style.  I measured the old and new shoes sole to sole and the new shoes are demonstrably smaller - by at least 1/2 size.  The new ones pinch my feet to the point that I should probably send them back.  I should have ordered at least size 10 1/2.  I also found the arch supports to be inadequate.