These are, hands down, the best sandals I've ever owned!  I bought them last summer when I was traveling in Greece for three months, and I easily walked 100 miles in them (at least)!  They're incredibly comfortable, insanely sturdy and best of all, they look GREAT ... you can wear them in virtually any situation, from the beach to a restaurant (with a sundress or nice pants).  The toning benefits are ABSOLUTELY as advertised ... you can feel the resistance when you're walking.  Particularly if you're doing a lot of walking, you get a double workout (which is especially handy traveling in Europe -- you can enjoy all that fabulous food guilt free)! :)My first pair will probably need to be replaced next summer and I'm DEFINITELY going with Tone-Ups again -- I couldn't imagine wearing anything else!