They may not be put on, due the neck(tube/ upper, opening,or what ever the proper term is.) being too narrow. I could not pass my foot through, to even try them on. I have worn many other high boots( Wellingtons,Engineers, Western boots etc.). I have never come across this problem.The boots are ill conceived and designed. I can state this with confidence, after receiving them: 1).I had them tried on by several other 10 1/2 D sized people, who I know. The problem was identical; and  2). I found some in a store, and had the identical problem. So, I therefore must assume(despite other rave reviews posted) this is a flaw; running through out this model. I must believe either; they never had someone try the fit, during prototyping(maybe they went straight to production from design?); or they have no quality control, and something was changed(unnoticed) during production. Due to their ineptitude, I will not chance buying another Caterpillar product. This is an elementary flaw. It should have been caught.