On the first day I wore these I experienced some irritating rubbing on my left foot (outside baby toe area) and the left boot appeared to be less flexible. At first I thought the left boot was defective until I adjusted the lace tension which resolved the problem causing me to feel a little foolish about my earlier conclusion. After breaking them in the boots are quite comfortable and the insulation is warm but not so warm that I need to immediately take them off at work. The sole seems well suited for snow. My favorite feature is the inclusion of top hooks for the laces that allow me to put the boots on and take them off without untying them.