My foot is narrow so the straps across the top are just too loose, my foot slides around. We have used and broke at least a dosen of chargers. Super easy to assemble and it fit perfectly in my closet. They take a little bit of getting used to compared to the more traditional PVC tips that come with most earbuds, but what a difference when you start using them! Loved the adjustable strap. Was very disappointed. They stay on better than anticipated. I am returning my first pair because one shoe (the left one) was slightly (but noticeable once on) larger than the other. * Sound Quality: I wanted it to be good - and the drivers arent bad, I dont think. I ordered the 3rd set, and didnt open it right away, as it was a gift for my boyfriend to finish his at-home-gym.