LOVE these slippers. My right sandal has a problem with the strap that runs from the front of the the sandal and loops through and across my foot to connect with the Velcro strap. I just bought these in mid April and used them for my first backpacking trip in late April of those year (I?m writing this not even two months later) I haven?t even put 20 miles on these Tevas and this happened. I ordered 3 different pairs of flip flops. Easy to use & easy to clean. The incredibly low impedance is the result of essentially a built in amplifier which pushes the 4 drivers incredibly well. As it stands now, I would highly recommend this headset. In the last couple years Ive been through about 10 or more audio plugs, head sets and other audio devices. - The Sennheiser app can be used to adjust equalizer settings on other speakers that connect to your phone, such as the phones internal speakers or a cars bluetooth. The cord is nice and braided which feels nice, but it does create a little bit of noise when you brush it against a zipper on a sweater or coat.