Very lightweight boot, I almost didn't believe it was my winter boot box when I received the package from Amazon. I haven't worn it in below -10 C yet, but it has kept me warm up to that temperature. One gripe - the shaft is VERY big; even with very thick winter socks, the boot is very loose around my ankles, and I generally have bigger calves and ankles. It means you can tuck in even very thick pants, but on the other hand, it also means that if you don't tuck in (or just wear leggings) and there's a lot of snow, all that snow will end up in your boots.