I have been happily running in the regular Kinvara 4, and I bought these to get me through marathon training in this crazy cold, snowy, slushy weather. The gore tex definitely WORKS. they are warm and, for the most part, very waterproof. (I ran 15 miles in driving snow and slush on Sunday and was soaked, but have done shorter runs through patches of snow/slush and stayed quite dry.) My complaint is that the fit is not quite the same as the Kinvara 4. The inner edge where the laces are rubs on both feet. I was hoping this would break in, but so far it seems to be getting worse. I did not get a blister - it is more like a bruise! No amount of loosening the laces seems to help. I will try to keep handling it to maybe loosen up the material. I am not sure what else can make this better.