last week - the ones I loved so much- well, they were returned this weekend. After giving myself a week to break them in, and subsequently losing the skin on the back of my left ankle because of them- I couldn't take them back soon enough! I've now settled on a pair of Nike Structure 13- Bowerman Series (what I had before), so I have no issues. And as you can see (photo below), the Nike + iPod Sport Kit wireless sensor fits perfectly inside the sole of the shoe. I'm now happy again! Please update me on your progress in the comments section.