These Keen "Whisper" model sandals are the second pair that I have purchased this season. Returned for one whole size bigger and they are close to being to small-- length wise. Specially for international travelers. Ive been using the giant screw-in old school bike hooks and always get hung up on the hook. The slit I was using was Intended for a aux of some sort and not for a charger. I did a lot of shopping around and chose steadyrack- great choice. Ive given them to some friends, family, and coworkers, and they love them too! 00 plus if real leather. Will get a better workout next month as Im planning on carrying two bikes on it across country from PA to MT and back. I wear an 8, ordered a 38, perfect fit!