I've been running in Saucony Cortanas for three or four years now. Starting with the first ones. I went to a running store here and was fitted and measured and they were recommended to me. Well I've been wearing an 8.5 this whole time. I have a very narrow foot and the more narrow toe/foot box worked well. I recently bought the Cortana 4. I didn't buy them off of Amazon but all of my previous Saucony's have been. The toe/foot box is larger. So it's as if the size changed in the 4th generation. As a result, I have to lace them extra tight. I am am avid runner who runs 30 or so miles a week so comfort and fit is very important.