If you find that flip-flops do too much flipping and flopping around to be secure on your feet, try a pair of Teva Hurricane XLTs. I am a big fan of this style of Teva sandals (what Teva calls the "Universal" strapping system), my previous pair were worn until they were getting very ragged; my BFF would burn them if I had a fireplace! I like them because they're not going to go flying anywhere when you wear them, with straps around the toes, around the ankle, and around the heel. I also like that they're all black, most Teva sandals have some kind of pattern on the strap but these go with almost anything. I've only had these a couple of weeks but I'e worn them semi-constantly. There are a couple of downsides to this model. First of all, the toe strap is not adjustable like it is on some Tevas. I found them to be a snug to almost too tight fit. Secondly, the footbed is too flat for somebody with high arches. I have also had a pair of Teva Terra-Fi 2's which (IIRC) has an adjustable toe strap and a better footbed but then it's around double the price and it doesn't come in basic black.