I returned these. I owned the original Walu, which I bought six years ago. But now it was time for a replacement, after having a hard time finding the original Walu I decided to give the Walu II a try. Big mistake on my part. While the memory foam in these is great, it's also coming up pretty high in the shoe. After walking around the house with these for about ten minutes I had blisters in my heel area. I never had to break in the original ones. So I had to return and decided to go ahead and find the original one.