Decreased pack weight: By minimizing the weight of the equipment you are bring with you, it suggests that you are putting less strain on your legs, making yourself less leading heavy and more than most likely decreasing your pack size which implies you can squeeze through more crevasses! Minimized clothing weight: Dexterity is assisted by decreased friction versus crucial locations of your body's movement. By having less weight, you are lowering the gravitational pull of your gear towards the ground, when a lot of people want to be moving forward.