In reply to tallsop:
My memory is that (from Reclusa in mid July) it was useful to have axe and/or crampons, so that you either don't slip in the first place, or have some means to stop yourself, or both - but little need to rope up. We certainly saw a runner doing it in trainers and flexible crampons. The path was well trodden and snow mainly mushy, but it's pretty steep off to the side (and harder snow in places) and you could slide a fair way.