When I first purchased these I found them to be slightly uncomfortable in between the toes and on top of my foot. Since I'm stubborn I continued to wear them and I'm glad I did! The footbed has slightly molded to my foot and I find them to be my most comfortable sandal. I choose them over my Dansko sandals. I don't know if they are really shaping up my hind-end but my calves have more definition than before. I also have the tennis shoes and find them to be extremely comfortable!