Kroops goggles, despite them being advertised as bicycling goggles, will interfere with the bill or the top part of your helmet. Causing your helmet to not seat right. Who wants that. Others have said the same thing. I ordered a pair and returned them right away. So don't waste your time on those.
I use Visorgogs, which are good down to about 5f to 10f before they start fogging. Lower than that I use a double-lens ski goggle. I can cover my nose and mouth with those and they don't fog up on me. My lowest temperature is -14.

Picking out goggles is tricky from person to person. My thought was to start out cheap and then move up from there. That was when I came across the visorgogs here on BF. But you can spend however much you want on them.