I bought some new shoes, Adidas Predators. They have these heels supports which are some kind of plastic but they rub on my heels and cause blisters. I've never had this happened before with any other shoes, sports or regular. I started taping a piece of cotton swab on the part of the heel where the blisters appear and it helps but I was wondering if there's any other way to combat blisters like that. Does anyone else have this problem with these particular shoes?