The size 6 fits just fine as the straps have some stretch to them. I have had more trouble with wired headphones. I love, love, love these! ill deal with these until something drastic forces me to buy my other model. there?s just one problem with them, they are soooo tight to get on! I wasnt sure about these shoes, reviews I read were mixed. This mini backpack is AWESOME! You can tone it down just enough where "you" can be heard, so I love the microphone. This squat pad is fantastic. I was excited to put it up but quickly realized the issues.