Premium Components - Sennheiser engineered transducers use aluminum voice coils delivering high efficiency, excellent dynamics and extremely low distortion Open Acoustic Design - Around-ear, open-back design delivers an impressively 'open' spatial presentation to improve the listening experience E.A.R Technology - 'Ergonomic Acoustic Refinement' design channels audio directly into your ears producing a more 'in room' like listening experience Extreme Comfort - Lightweight yet robust design with luxurious velour covered ear cushions and padded headband deliver exceptional wearing comfort for long listening sessions