Hello, The choice of crampons depends on many factors, your skill, your shoes, and your chosen activities. For choosing the right binding please consult : http://www.petzl.com/en/outdoor/how-choose-binding-system In general for choosing crampons we recommend to go to a retail shop with your shoes and try the different model, if possible rent a pair to test them on the field to make the right choice. Sincerely