In reply to wbo2:
The flex is mostly at the toe, but they are very bendy. I can almost fold them in half in my hands, substantially more flexible than the Ribelle. Interestingly the Cubes don’t fit me, loads of heel lift, I used to use Scarpa (Rebel Carbon) but I find the newer ones to fit badly.
I’m generally big on flexible and minimal footwear, but I’m just wondering at what point it becomes an issue for crampons? If they’re really cranked on tight with a flex bar are they realistically going to fall off?
I currently use the Salewa Crow which is very nice, good wide toe box (quite flexible too) but crampons causes a lot of heel rubbing in them on my last trip.