I understand the difference to between Sidi's whole and half sizes to be slightly different than stated here.
The sole of the 42.5 will be the same length as the 42. However, the toe box will be taller/more square in the front, thus giving extra length via the upper.
So the toe box is roomier, but I'm not aware that the width is greater.
This is my understanding of the difference, but I could be wrong.I can check with the Sidi folks during regular business hours and post again later.
Susan
BTW, I wear Sidi Genius shoes. I've had mine for several years and I'm finding that they wear really well. Despite being a few years old, they look nearly brand new. I've worn out the little rubber heel pads, which are easily replaced - a nice feature.




I can check with the Sidi folks during regular business hours and post again later.
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