I took these to Siberia nearing winter thinking they would be enough.  Even at those cold temps they were worthless.  "Extreme Winter Glove" is a misnomer.

May sees temperatures rise above freezing, averaging 44 degrees in Verhojansk and 37 degrees in Yakutsk. During July, the warmest month for most of Siberia, visitors are typically able to shed most of their cold weather gear and enjoy average temperatures of 64 degrees in Yakutsk and 59 degrees in Verhojansk, with little risk of the temperature dropping below freezing.

During winter, average temperatures in Siberia range from -10F (-23C) to below -50F (-45F).  So if I had taken these in winter, I would have been dead.

During fall I still had to cut up a pack of wild gerbils and use the fur to keep warm.  The fur was all wet since I didn't have time to dry it out over time under the sun.