Indigo mentions use with thin soled shoes but those MKS he mentions are pretty uncomfortable with Chuck Taylors and the like. If you want thin sole comfort and use clips and straps, these are much more comfy as the pedal body is more of a platform compared to the MKS tour stuff where you can feel the spindle and cage through your shoes. Trade off is not as much grip if you really scrape the bottom of your stroke. They can be tough to find, however. SR Sakae CTP-400: