After wearing the Un Ramble Go shoes for 2 days (1 in the office and 1 walking around the mall for 3 hours) I developed a blister on the top of my right ankle. right of the heel. They are too stiff and not at all soft like my previous Clark's in.Coil shoes. I returned the Un Ramble Go and bought the old un.Ravel model as the Un.coil is no longer for sale and I'm very happy. They fit the same as Un.coil, just with a different aesthetic.