the plastic covers are only mounted using spring clips. If you want true noise cancellation, youll have to spend quite a bit more. Cest cher ! Were a perfect fit and have remained together since. They are comfortable to be in and walk around in, oddly it took slightly longer to negotiate getting the left foot into the boot, but as I say it fits nicely and looks great when on. The only complaint about the headphones is after a short while my ears become hot and sweaty. Und eine Gebrauchsanweisung, deren Deutsch sogar wirklich gut ist (Kommt, Leute, das ist echt nicht selbstverständlich. I believe it can help get it to the top. They are the perfect length for my size 7 feet. But, unfortunately these run really small.