Firstly - they really are the genuine article ie they keep the snow and the rain out! So although the laces are genuine (ie they can change the fit of the boot both ways) they are backed by a membrane that stops the wet sneaking in via the tongue. Plus the zip is also protected from both wind and rain (and snow!).
BUT they're not overly fleecy inside, so as long as you don't wear them in a heatwave, your feet don't overheat. And this, really is one of the main reasons thes boots sell like hotcakes - because you can wear them for most of the year, they look and feel fab, and they're basically weatherproof!
Plus plus they come in half sizes, the footbed is removable (handy for cleaning and for orthotics) and they're really lightweight!
And finally if you love these but are not 100% sold on the colour, check them out in the navy!