The Canadian Forces' Boot, Extreme Cold Weather (also known as the Boot, Mukluk) comes in three parts: the white nylon-and-rubber outer boot, the insole, and the white cotton/wool 'sock' - essentially a sort of bootie that could, in theory, be worn separately as a sort of slipper, but in practice would get you yelled at. Assembly is straightforward; insert insole into boot, put on 'sock', put foot into boot, and lace. This latter is slightly different from your standard boot, as - to provide better ankle support, as well as to keep the mukluks on your feet - the laces have to pass through a tab at the back of the boot before being laced in front at the ankle. The result is a boot that - while having slightly less traction than the combat boot thanks to a lightly textured sole - is warm enough for temperatures and weather conditions where wearing combat boots would be detrimental to your podiatric health.
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It also matches nicely with the other solid white Extreme Cold Weather equipment - that is to say, the Mittens, Extreme Cold Weather. (They do give you white snowpants and snowjacket, though.)