Fenestrated Sheepskin Replacement Ear Pads for Sennheiser HD820 Series Headphones. The Sennheiser HD820 are Sennheiser’s counterpart to the beloved HD800 and 800S, sporting the same sleek design with a beautiful glass panel to turn these cans into truly high-end closed-backs. Dekoni looked to add to this prestige with their line of earpads for the HD820, giving audiophiles the opportunity to tune the HD820 to their liking. These pads are made with Fenestrated sheepskin and high density memory foam, creating a wide soundstage and soft cushion for you to relax in. When the heat-activated memory foam molds to your head and seals you in, you’ll find it easy to forget you’re even wearing headphones. Dekoni Audio has introduced a new era in ear pads with the new Fenestrated Sheepskin ear pad. The pads are designed to be cooler and more comfortable than any other pad and has the added benefit of helping to give the headphone a cleaner sound stage by reducing reflections of the direct sound before entering the ear.