A look to be making custom in-ear earphones with atrial footprint to 500 and above, the Shure SE215 is a good deal and it does seem to be designed for modern musicians, the bass is much exaggerated high mids are attenuated and Acute smooth even if they are there and climb high enough. In summary flattering extremely pleasant listening to the proper feel for the groove drummers and bass players also. My reference headphone is the Beyer Dynamic DT880Pro which is necessarily more balanced.
It there's a little time learning to position the headphones, and it took me juggle several tips to properly fit my ears. Fortunately Shure provide us all 6 pairs of tips, in fact two families with 3 different sizes. The first are like foam caps "Ear" and my left ear works perfectly with the biggest. The right ear was uncooperative with the same nozzle but the L version of the second umbrella-shaped silicone family finally did the trick. Changing tips is quite difficult, a hand to take.
The strength of the caps is essential as the slightest imperfection distorts the stereo image in the lower midrange and the bass, not to mention the desired sound insulation. In guesswork I would say I get about 15dB attenuation compared with 24dB for a custom earpiece.
Outgoing earphone cable then passes over the head in a formable cables sheath and two headphones can be found behind the head with a coupler that allows the tightening around the head.
There is also a pocket and a tool to clean the ear canals they were encumbered by what was in the ear before putting the headphones.
For me it lacks in lot a stereo jack adapter 3.5mm -> 6.5mm because it is not always on stage, and adaptation to his own ears can become difficult, resulting in a star less.
Sum all good headphones to good soundproofing which also makes traveling more quietly while allowing air to sleep with because nothing surpasses the ear. There are plugs and cable separate sale in case.
A battery that I'm quite moving I find that there's a mechanical transmission cable noise but did not hear when I play so it goes. The sound proofing in my case seems to be around 15dB, the battery is attenuated but still there