True North Mountain shirt
The second factor is, climbing is incredibly subjective. A mountain that is always covered in ice is going to be near impossible to a sport climber whose never left sunny crags in the True North Mountain shirt, even if they climb 5.15c (9b). Someone who has asthma may be able to crush ED M7 WI5+ routes in the alps, but struggle even trekking above 5000m, while the person striding confidently past them might totally loose their nerve top roping an ice climb, and gets to the top of Everest. We all have our “toughest challenges”.
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Best True North Mountain shirt
Weather is often a huge factor as well. Horrible conditions on Cho Oyo can make it much harder then K2 on a good day (Since really K2 has only two challenging sections). Mt Robson in Alberta is a very popular peak and True North Mountain shirt, yet all the people who try Robson are very skilled climbers for the most part. They are often on their way to the summit when horrible weather forces them to retreat.