Wolfhammers are not flat pedal winter shoes. They are clipless winter shoes, despite any marketing obfuscation.
Flat-ish sole winter boots are generally the best if you are riding in actual winter temps.
It's really just "pick your favorite winter boots", I'd suggest winter boots with a flat sole. Ones with removable liners like the Sorels are generally warmer. Be sure to get whatever big enough for your thick winter socks. It's usually easy to build up the foot bed if you go too large, but too small is not sustainable for riding IME. Columbia, Sorel, Merril, etc. Once you get the flat sole, then it's about your pedals having enough grip, like good metal pins. Plastic pedals with plastic pins may not be enough.
Flat-ish sole winter boots are generally the best if you are riding in actual winter temps.
It's really just "pick your favorite winter boots", I'd suggest winter boots with a flat sole. Ones with removable liners like the Sorels are generally warmer. Be sure to get whatever big enough for your thick winter socks. It's usually easy to build up the foot bed if you go too large, but too small is not sustainable for riding IME. Columbia, Sorel, Merril, etc. Once you get the flat sole, then it's about your pedals having enough grip, like good metal pins. Plastic pedals with plastic pins may not be enough.