The level of difficulty consists of several factors like technique, fitness, exposedness and so on. You can find the requirements in the tour descriptions. SUMMER easy: walking in pathless terrain, in snow and easy ice terrain, no or few danger of falling. You are required to climb approx. 300 vertical metres per hour. mittel: no fear of heights, walking in exposed sections, easy climbing up to grade II UIAA. You are required to climb 400 vertical metres per hour. schwer: often exposed sections with a danger of falling, climbing up to grade V UIAA.