I use a pair of Khombu boots that I have had for years, hiking or cycling below freezing and trudging through snow are no problem. The label when I got them had said something about sherpas wearing them while climbing Everest or something like that, I just know that my feet are always warm and dry even in negative weather. For more professional-ish looks, I wear Skechers 'adventure' boots which are weatherproof but also look nice with my professional work attire, they still keep my feet dry but ate not as toasty or rugged as the Khombus.
well I was going to say negative temperatures but here in the US our negative number is quite a bit different than yours since 32° is our freezing point, so to get below zero here is more negative-ness in your measurement, lol. -1°F is about -14°C so your lower negative numbers are still above freezing here. Where I live it can often get -14° in the winter, that's about -25°C 
so to save myself (and possibly others) confusion I said 'negative weather' rather than trying to figure out who's negative we were using as numbers easily confuse me. 
Regardless, my cozy boots work well even below that!
