I have Keen sandals and they are very nice, but for harder riding I prefer a stiffer sole. In the past I have used road shoes. They can be a pain to walk in and I always carried a second pair of shoes. These days I ride with Sidi MTB shoes. I can walk in them and I could use them as my only shoes. I don't. I also carry a light pair of sandals for evenings. There are probably better MTB shoes for all around use, but the Sidis fit me nicely and are nice and stiff. This is one of those personal preference things.