The external boot provides only mechanical conveniences to a foot, while temperature comfort is offered by inside boot. Except for offering heat-preserving properties, the inner boot fulfills additionally many different duties useful for the vacationer during campaigns. For instance, so as not to drag the whole building covered in snow to the tent, an external part of the boot is left at the entrance, and the inner one is used for strolling inside the tent. The internal boot, as a rule, has totally different variants of design. Thus, if on the very starting of ascent it’s necessary to overcome rocky …