There is elastic inside the heel strap to keep the shoes on your feet. This Amazon Basic Male to Female Stereo cable is the perfect length at about 6 feet. they have a little bit more growing room then some other sandals which I like. Hermoso Happy to see the show back for season 7. Just need to be patient and not use too much! It was perfect, received a lot of compliments. A good buy if like me you have wider feet. * Microphone is awful. I prefer mine a bit tighter anyway - according to Birkenstock, the straps should be loose enough to let most of your sole rise from the shoe bed when walking.