The two sandals were different sizes eventhough they were both marked 11. So a pair of good tennis shoes is essential. This is the first time using it and it was a real change from what I used before. There is some lag when you turn them on or adjust the volume, but the audio is very good. I prefer it just slightly above my ear. Worked very well for my little wall planter This is one of my favorite purchases. I wore them 3 days in a row when I got them. 5", and fits perfectly in size 18-24months. These are harder to remove than a McDonald?s toy from its wrapper with greasy fingers.