In three hours of use I found the seal to be relatively good (I chose the smallest of the three tip sizes) and the outside noise cancellation was much better than my iPhone headphones. However, the low frequencies were very weak - I'm not a music lover, but I found that when I turned up the volume to compensate, the bass in the songs diminished and the highs became uncomfortably high. Ultimately, the right earbud failed after about three hours of listening. Routine use hence a star rating. Needless to say I would not recommend either these headphones or this seller.
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