"Polar Bears" was the nickname for the American soldiers who were sent to Arkhangelsk in 1918, to intervene in the Russian Civil War. The troops were primarily from the 339th Infantry, from Michigan.
It will be interesting to compare them with the HLBSCo troops. Looks like these troops have Lewis guns, rather than the BAR that HLBS have. However, like the HLBS, these soldiers appear (to my untutored eye) to be equipped with Springfield M1903 rifles. The AEF Siberia (in Vladivostok) was equipped with Springfields, but the Polar Bear expedition (in Arkhangelsk) had Mogin-Nasants.
Of course, they will be suitable for any arctic or antarctic expeditions, competing with Bolsheviks for control of the Bering strait, looking for cultists in winter in Vermont, cutting off Al Capone's whiskey shipments from Saskatchewan into North Dakota in January, hunting German "weather stations" in Greenland...
I'm sure I'll be ordering some once they get to the webstore!