Any standard steel mountaineering crampon with anti snow plates (essential) is fine for Mont Blanc. (Fully stiffened B3 boots will take any crampon so don’t worry too much about the C1, C2, C3 rating). Technical ice climbing models such as the Grivel Rambo are less appropriate as they are significantly heavier and one can trip over their longer front points. Lightweight aluminium based ski mountaineering crampons (e.g. Grivel Air Tech Lite) are not strong enough and would be likely to break on the mixed ground in the lower part of the climb.
Suitable models: Black Diamond Serac, Grivel G12, Simond Makulu 2 mixte, all with any fixing system. Anti snow balling plates essential.
1 pair (possible to hire from us, 40€ per week)