For you Nike boot owners, can you comment on how warm they are?
I've only ridden Kaijus, but I've never had an issue with my feet being cold. My friend who rides ZF1s and DKs have never complained as well.
Granted, this is in Tahoe where the temperatures aren't THAT extreme, but still.
And like snowporn said, Nikes use a reflective heat liner in all their boots to reflect the heat back towards your foot. Some space age material shit.