Hifiman Edition XS planar magnetic, over ear, open back headphone. An updated version of the excellent Edition X, Edition XS uses two newer Hifiman technologies to improve the sound quality: Stealth magnets and Supernano diaphragms. Stealth magnets are curved on the outside surface to improve airflow and reduce back-wave interference - this improves clarity and makes for a more spacious soundstage.
Hifiman Edition XS specs: