The HD 820 headphones from Sennheiser aim to provide the best, individual listening experience available. Unlike the flagship 800's, the new cans feature a closed-back design for a realistic, natural sound field. This provides listeners with a re-creation of the sound that is closer to how it was recorded and intended to be consumed, without imposing on the audio space of others. They even boast glass covers on the exterior to help reduce resonance. And to round things out each pair has microfiber ear pads, OFC cables with gold-plated plugs, and a metal headband with an inner damping element.