Sidi's do tend to run small. I wear between a 4.5 and a 5.5 in most shoes and my Sidi's are 37's. I have even seen 36's in Sidis - they are too small to squeeze my feet into....
the sizing info page says Genius 5's (yeah, the soles are not carbon, but they will still be good and stiff) come in 37's http://www.sidiusa.com/sizing.html
as far as Zipp goes - they must have heard you, as they have Kirsten Armstrong splashed all over their home page right now....



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