These come with a lot of silicone and foam ear pieces, I just grabbed the smallest ones and those work for me. Also, it is too tight over my head and pushes hard on the top of the head. I suspect over time all these devices lose sharpness, but Panasonic claim you can get spare blades (which I doubt is true). My feet still sweat on the bottom when I?m moving quite a bit, but not as much as my old pair which did not have the air holes. I have always been annoyed by the slow and steady build up of lint in the iPhone lightening port and ultimately the charger cable not making a good connection. Holds your bicycle upright I have a wide foot and they still fit great. I gave it 5 stars only because its14 inch limits capacity . This fits in a tight space that we needed it for and it looks nice. Theyre great for just about all genres except for heavy metal.