Estan muy cómodos y bonitos. I honestly thought i was back the gig in the eighties, front row. The heels of the sandal have balls where your heel strikes, and the adidas symbol is gone after only a couple months of use. Did I mention that the silicone band gave me a nasty rash on my wrist because of how tight I have to wear it? I usually use metal bands on my watches because they can let air in through the segmented parts of their links and I wear them loosely. Records these as an add-on for my kids? Kindle Fires. They definitely dont twist off despite that being how its done for the Z7 and Z1R. Truly these perform as well or better than headphones five times the price. For under $14 I was very surprised at just how good these sound, and the comfort is not bad either (just keep in mind that these sit on your ear if thats an issue for you, but it shouldnt present much of a problem if at all, really. The volume controls work, but (at least for me) theyll probably stop working after a year of use, kinda on the cheap side if you ask me. I called Sennheiser to learn that this product line had been sold to Demant Sound.