I suppose for those not prepared it could be dangerous. Years back we rode snowmobiles on the Mi Up and WI highways because the trails were impassable, coldest I recall was -30F temp (not windchill adjusted). Had barely a pinhole of vision on the fogged visor, steering and susp. joints locked. We carried small bottles of HEET and would pour it over the frozen parts. I once did a piston / ring replacement on a 3 cyl triple in -10F temp. Couldn't feel my fingers! Crazy days.
So today, thought I'd tune up some vintage wooden backcountry skis which led to looking for pine tar to purchase. Looking online and found this crazy story.
China hunters / skiers.
Deep In China, 'Cowboys' Have Skied For Thousands Of Years : NPR
But this isn't just about making it down the mountain: The skis are for hunting. In a region that can get temperatures of 40 degrees below zero, these hunters don't even know what frostbite is. In a single-file line, pulling sleds, the men search for elk — elk tracks are obvious in the snow because of the animals' heavy weight. On skis, they can track the elk for three to seven days.