I have a pair of Berkinstocks that I have had for years. You slide your foot into them (not sure of exactly what type of design that is, but I wouldn't call it a sandal really, although you would have to wear socks for your foot to be completely covered at the heel. However, your toes do not show and they are not a thong. At any rate, I love them and have always loved them for their comfort and the style never seems to go out. I wanted to try a pair of sandals and tried several different designs before finding one I was happy with. I first ordered a pair of thongs, that had the Birkenstock name,  but were not called Birkenstock (the Betulas) but the foot bed was not soft, they were too small and too tight. I returned them for a pair of slide in, not a thong, and liked them, but I thought they showed too much of my toes/in a weird sort of way (the Arizonas), and that they made my toes look big and ugly. I exchanged them again for the thong design and although they are little uncomfortable between the toes, not so much so that I believe they will stretch and get comfortable, as soon as they are worn for a couple weeks. I like the way they look but the foot bed doesn't feel as soft as the slide in/Arizona's that I had. I am going to keep them and as I said, I like them enough that I believe they will stretch out (the ones I have ended up being satisfied with are the Adria design. I loved the way the Arizona's look and feel, just not on my foot. I am obviously hard to please, but am a fan of Berkinstocks since I have had my first pair and was confident I could find a pair I liked.