Sin embargo la carga es directa por usb pero el audio no es transmitido al mismo tiempo por el cable, es decir. Exactly perfect! it does have memory foam - that certainly helps; its made with natural latex - a rubber, that takes back to its original form. The rack will not lift up or rock. They were a bit snug at first but stretched out after wearing a bit. Comes with four different earbud sizes which I appreciate, although it would be nice to have multiples of each in case they get lost. Overall, these are great and at a great cost! The shoes were beautiful and fit perfectly. It just did not do the job it was supposed to do. Battery seems fine, printed manual text too small and mousy English.