Totally satisfactory product

I do not know if this is the best pair of headphones for smartphone, anyway they are the first (and only to date in my case) that provide true comfort staying in place and not falling not the slightest head movement or when your arm touches the cable. Ditto if like me you use it with a motorcycle helmet a little tight, no need to take it three times causing the helmet headset with it, the problem ended with Bose system, the system is really ingenious and is completely forgotten after a few minutes. Not being a real-ear system, intrusion sensation is much less and were much less quickly feel like a peach stone that pierces your eardrums :-) So obviously this is done expense of masking background noise, not yet tested in a train (but for that I have my helmet covering Philips Fidelio), but eventually wearing comfort trumps everything else. For pure musicality, not having perfect pitch I let others decide on the matter, but I have seen nothing disturbing to my side. Level phone no complaints either, perfect hearing on both sides no complaints on that side, note the really microphone position on the chin and not the navel as with many competitive products.