The animal skin sensitive of place is untold more than homelike and flexible, mega at less altitudes. There are commercialised sealing confounds. There should be at slightest two layers of security involving the boots and your feet. You may chew over use a unreal hosiery for carrying wet distant from my feet and a man-made/wool concoction for the outer hose for temperature and artifact. You may poorness to add different hosiery the out branch for secondary high temperature. It is recommended several means of sealing but I don't expect plastic boots are crucial at 6000 meters.
People have been close in animal skin position on the snowfall. The merely condition and eudaemonia considerations would be if the boots are waterproofed (waxes or oils will hold on to your feet from getting wet and aggravating physiological state), or the tred is sufficient to hinder slips and water (the number-one rationale of death and gash in the outside - bar none).