Different sizes for different colors???
I already had a pair of Nimbus 18s in the Lapis/Silver/Sport Pink, which fit perfectly and are super comfortable, so I expected the same when I ordered this pair - the Titanium/White/Turquoise. However, I think the sizes must be different for different colors because this Titanium/White/Turquoise pair is significantly tighter on my feet than my other pair, and if I wear them for over a 1/2 hour, my feet go numb! It doesn't matter if I'm walking on the street or on the elliptical at the gym, feet go numb by the half hour mark.  I have had these shoes for about a month now, and I'm still hoping to where them in to the point where they're comfortable, but my prior nimbus 18s in the Lapis/Silver/Sport Pink never made my feet numb at all, and never felt tight...