Every third hole has a small “U” shaped notch to make it easier to identify the same level between posts. This has become more apparent with more use. Purchased for my brother that us blind he loves them especially the velcro he was surprised how sturdy it was which was his concern, he wears them all year around because circulation in his feet, very impressed with the bottom grip and that their hiking shoes more padding. Secondly if the feature is activated, your music will sound terrible. To be honest, they dont feel like an expensive pair of cans; but i dont care. Bose "ToneMatch" can be turned on or kept off with a toggle switch for each non-Bluetooth/Aux input. Lunique bémol serait pour les possesseurs de smartphone non étanches. I can see the small opening on both shoes where the stitch broke and its mildly infuriating. Also have an option for Micro Card playback. He could have been mayor of New York and President, unfortunately America is so warped and the populace so controlled.