I bought these boots for my wife who suffers from Reynaud's Syndrome (sufferers lose blood to their extremities extremely easily and it is painful)so it is crucial that she is kept warm in particular her hands and feet. Up till now whatever boots we have bought didn't really help that much even quite expensive ones. However, these Merrell boots are fantastic and have so far kept her feet really warm (if you knew my wife you would understand how unbelievable that is!!). it is still early days yet as the really cold weather has not set in yet but she has even complained that her feet were too warm at one point so the signs are good. Yes they are expensive, but they appear to be well made so we expect them to last more than one winter, and if they work as well as they have so far then it will be money well spent. At the end of the day I am a great believer in 'you get what you pay for' so we cant recommend these boots highly enough. In fact I think that Merrell should get in contact with the Reynauds Society as other sufferers would be interested too.