I've been there last year. The oxygen Level at that height is about 30-40% less so you breathe heavier and you move slowly. It's also utterly cold. Everyone is

I've been there last year. The oxygen Level at that height is about 30-40% less so you breathe heavier and you move slowly. It's also utterly cold. Everyone is wearing heavy jackets, gloves, and hats. It was funny seeing some people drive up in their rental mustangs. I can only imagine their brakes cooking by the base of the mountain after that downhill drive.