I love these snow boots! They are so comfortable and warm. The testing time will be when I am in -20 degrees next week, but I don't have any doubt that they will be perfect. My only disappointment is that the flat laces catch on the sharp metal hooks at the top of the boots and one lace shredded when I pulled it for the first time around the hook. I called your customer services and was pleased that a replacement round pair would be sent to me immediately, but 4 days later I am still waiting for them to arrive and I am going away in a couple of days.