I have been wearing a pair of the size 45/11 slipper boots for two months now and I can confirm that they are both warm and comfortable. I have very cold feet and wear them with Nordic merino wool socks. They are easy to slip on and the design keeps your ankles warm too. I can’t fault them and although I shouldn’t I do nip out to the shed in them if I need an emergency bottle of alcohol and the ground isn’t too wet. I would unhesitatingly buy another pair if these wear out but that doesn’t seem likely to be anytime soon as they are very well made. And not from China! Amazing!