The problem is the thong part. The Good:1) Bluetooth + 2. I am unsure that these boots could ever be improved on, they are perfect and highly recommended. As soon as you unbox the headphones you realise that everything about their design is Premium - the headphones have been well designed and look elegant whilst retaining a rugged build standard - the big 50mm drivers are evident but unlike many ANC headphones there is plenty of room, even for oversized ears in the soft pleather ear pieces - the headband is also made of a quality pleather material and the Shure logo has been imprinted on the underside of the metal headband. Unit sits very balanced if assembled correctly and does not scratch the wood floor. We finally did get the individual boxes together but linkage only worked on the first three boxes. The quality is 5-star and they didnt rip or tear at all during the workout. Youre likely to end up saying "theyre smaller than I thought! Now it wont even connect. 2 miles three times a week.