1" extra room lengthwise in my usual size (way too big). However, putting these pieces of junk in the same grouping as original Birkenstocks is dubious at best. 4) The head tracking center drifts if you keep your head turned for too long. if i could give this headset more stars i would. What a great sandal! Make sure to match the feet downwards for stacking. Wore it to wedding, Lets just all eyes was watching ????????. Now I have to buy something new from somewhere else. The minimalistic approach continues with the controls and ports at the bottom of the right earpiece, where you?ll find the power button, a multi-function slider button, the volume controls, a 3. You have to understand that the speakers are located on the lower part of the earbud and adjust there.