I have had the X-Country, the Vertical K, and the Wildcat. I have tried these on and they fit about the same as the X-Country and the Wildcat. I wear a US 9 and have 42s in those. The Vertical Ks were like .5 size too small. So if I were you I'd only size up .5 if you need a little room to splay or those C-lites were a touch too snug.