I got this pair of boots and went hiking through the upper Michigan woods on the first day out of the box.  For over 3 hours!!!!!!!!!!  It started raining about 2 hours in and the boots kept my feet dry and toasty all the way.  There was no break-in period and the memory foam soles were a treat for my feet!  The boots run about a 1/2 size small, so I would go up if in doubt.  I wore mine with lightweight smartwool socks and I was completely comfortable.  I highly recommend Jambu and this boot.