There's no information in the Keen dealer catalog about what's used to stiffen the sole. (I just checked.) At this price point, definitely not carbon, though. Most likely some sort of nylon. They are quite stiff. We received our shipment on Friday and several staff members are drooling already!
We're carrying both the men's and the women's sizing here:
http://www.teamestrogen.com/brands.asp?brandID=129
Hope this helps.
Susan




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