After 2 days of wearing the Un Ramble Go shoes (1 in the office and 1 walk in the mall for 3 hours) I developed a blister on my right ankle in the upper right corner of my heel pieces. 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.