I bought these last year after my third c section and knowing it would be a while till I was back in the gym (ha - you can say that again, still not there!). Anyway the shop said that sometimes they hurt your heel for the first week, but they soon wear in. Well one year on whenever I wear them I end up with huge weeping blisters on my heels. I thought it was just me, but this week have discovered that 2 friends of mine have exactly the same problem. So is it just our locl shop selling us all the wrong size or have other MBT suckers found the same thing. Feel like writing to MBT to try and get the not inconsiderable investment back!