There is a white noise level when ANC is on, however it's low, and imperceptible if there is any significant background noise or you have music playing. The white noise is not perceptible in transparency mode, and is completely gone in off mode. Obviously the fit is never certain, you can always return them if they don't fit. For me they're the best fitting earbuds I've ever tried. They stay in my ears perfectly even when smiling or flaring my facial features. Never had that with any other earphone.