Hate to get ticky-tacky, but did anyone else notice that 2 + 10 + 65 + 30 = 107%?

I don't recall if it was this forum or another, but I went through this whole deal about a year ago, even getting down to black-body radiation and total heat loss from respiration.

Breathing turns out to be a large heatsink for your body. Basically, the air you breath in has to go from its current temperature and humidity right up to body core temp. and 100% humidity. That's a significant amount of heat loss. There are masks, like PSolar and PolarWrap, that use heat exchangers to recover heat and moisture from exhaled air, then use it to warm and humidify the inhaled air.