The only reason they got 4 instead of 5 stars is that the flip flop noise is annoying. Will definitely be recommending these to friends and family! This provides it, comfortably. returned for refund. Tested it against my ipads 12W power adaptor and apples regular usb cable for iphones/ipads. The outer material of my Gore-Tex garments that used to soak with water now repels them easily. He walks around in them around the house, when we go out, etc. Granted, the 598s are open back just like the dt990s. -Al ser de tipo cerrado, el sellado para el asilado de ruido es muy bueno. I am really pleased with these slippers.