2/1/13  I purchased this hat for my fiance as part of his 2012 Christmas gift.  He loves the hat.  It is made very nice and is very warm.  We like to walk many miles early in the morning and here in New Jersey we are getting some pretty cold weather.  He has worn this hat several times on our walk and his head and ears have remained comfortable and warm.  I will probably by him another one before Carhartt makes this design obsolete.  It is that nice!
My fiance about 5'4",a fit man, but obviously not a giant.  Since the hat is one size fits all and it fits him, I would caution you larger fellows that it might be too small for you.