While the holder itself is substantial, the hardware they send with it is absolute garbage. My shoes were delivered somewhere other than my home. I use them while Im on walks to listen to music and also talk on the phone. Everything is all great in terms of battery life and sound quality untill one of the ears decide to not connect anymore out of the blue and no matter what you do it wont work. I have a 2300 square foot house, so maybe that has something to do with it but it shouldn?t. It is wrost productOnly works properly for 1 dayFrom second day it delivering very slow chargingDont buy it The Thule is extraordinarily difficult to use though I finally have developed a technique that works, albeit with extreme frustration and unnecessary fiddling. Would not pair, no sound. Obviously this is not a walking shoe but walking even short distances is uncomfortable. They also move to the side when he walks, leaving half of his foot out.