I've been running in Saucony Jazz 6000s for several years (not the same pair!!) and thought it was time for an upgrade. I trust the brand after all this time so I've bought some Grid Jazz X running shoes. My problem is that after about three miles I develop blisters under my arches - anyone got any ideas how to stop this? I use 1000 Mile double layered socks which claim to guarantee blister free running but they don't help.
Please help - the blisters are agony right now.