Based on the sales puffery with no back up statistics.
I never understand why if I looked for specs on a man's shoe I would get an official and verified weather rating. Like 40 to -10. In women's shoes you get " beautiful and good in any weather". Well it's going to be below 0 where I'm going so I'm taking a chance that I have interpreted your puffery correctly. TBD. The shoes fit well and look great but I have yet to find out if my feet will stay warm.