Wow, four balloons above 13,000 feet and one, Gas 1, around 15.3 and 15.4 kfeet!
"At cabin altitudes above 14,000 feet pilots must use oxygen at all times."
And most people would want to use oxygen before 13 kFeet, so I guess
many in today's race are fully O2 masked up.
It must be doggone cold, too. Would like to see what they look like
at altitude with respect to clothing.
Just found this relevant info from the FAQ. No mention of clothing
or heat sources, if any (doubt any allowed for safety reasons). Surprising
about the "not hungry" effect.
They’re confined in a very small space for three days of what one pilot
drolly terms “aerial camping.” Almost all the teams say that since they
are on oxygen and not moving around much, they are seldom hungry.