I am not sure if it does that. I don't need it perhaps in Helsinki, but I was thinking of having something like that for an emergency situation. Or to use it during -20 degrees. It actually does get cold down here and it feels colder because of the humidity.
I only googled and found some Quoara answers, but I don't know how reliable they are:
>When a fluid moves around a body, the fluid flows around the body in a predictable manner. In particular, at the point where the fluid first encounters the body there is a phenomenon known as the bow wave effect. This is the tendency of the fluid to move outwards and around the body in advance of the leading edge of the body:
*picture related*
>Now, here's the important thing: Most of the fluid is in what is called laminar flow, meaning that it flows along the surface at more or less the speed of the fluid. But at the boundary layer, in particular the leading edge boundary, the turbulence causes the fluid to create a small vacuum. So in the area in green above, there is almost no flow at all.
>Now, what does this have to do with parkas and fur trim? Well, it turns out that the bow wave effect is proportional to the area of the leading edge of the object that the flow is around. Or, to put this another way, the fur trim on a parka increases the effective area of the leading edge, leading to a larger bow wave effect and hence the creation of a zone of calm area right in front of your exposed face.
>I myself have experienced the difference between parkas with and without fur trim many, many times, and the the difference is startling. Particularly when the wind is head-on, parkas with fur trim make the difference between relative comfort and rapid frostbite.
>So, what's super interesting is that while I know the exact answer to this question, and this was widespread knowlege of this in the arctic, there does not appear to be any literature on the subject. This would make a great Masters (or even PhD) thesis, and best of all you could do it in Engineering, Anthropology, Fashion... the possibilities are endless. I can even see the title now: Percieved and Actual Cooling As A Function Of Fur Trim-Induced Bow Wave Effects in Traditional Inuit Garments: An Empirical Approach.
>Does the fur around the hood of a winter coat actually do anything?
Yes, it creates a microclimate out front of your face, breaking up the wind before it gets to you, keeping your warmer. Even if you bought it just for fashion.
>Real fur and especially wolverine, wolf for example does not ice up from your breath condemning in the same way as other fur and synthetic ruff. There its a mix of the coarser, stiffer guard hairs and soft, fine under hair in good quality fur ruffs. Wolverine hairs are also smooth and don’t have tiny barbs on them like other hairs from fur.
>Coyote is the most common today and works decently but not as well as wolverine.
>So you make rime ice, which is frost whereas other real and fake fur ice up with structural ice. You can brush off the rime frost instead of having to pull chanks of ice off lesser ruffs. This is not a danger to urban parka wearers but is key if you are out on the land away from civilization. Structural ice is heavy and can pull the hod and ruff down making it less protective and compromising vision.
>So yes, a properly sized fur ruff on a hood plays a key role in wind breaking and insulating.
The topic of Fur-lined hoods now interests me.
I would love to wear Uschanka but I think I'll look autistic in one.
I bought a pair of heatable work boots for my father back in the days after he complained about stiff feet due to cold (he is one of those types that spends 99% of his time outside their house doing something) but during recent years it hasn't been cold enough at their home area. Still, a great purchase.