They are so comfortable, this is my second pair. I simply dont know yet. I like the rubber sole underneath the sandals because of the durability. It was my fault for not installing or testing the unit sooner, but again I felt the product would be in working order. The newest ones are the lowest quality with the flimsiest mic and shortest wire yet. This purchase is a little disheartening. It came in plan packaging and not an Apple branded box (who really cares about that considering this is much cheaper than buying brand new from Apple). The premium price tag is just disproportional to the value you are receiving. It was intimidating with all the pieces, but took no time at all. 1 sound, which frankly is terrible save for its necessity in PvP online gaming.