cocoon

1 something that encloses another thing especially to protect it he retired to the cocoon of his study whenever he'd had enough of the company Synonyms armor, capsule, casing, case, cover, covering, encasement, housing, hull, husk, jacket, pod, sheath, shellRelated Words cartridge, cassette (also casette); bark, crust; carapace, house, mail, panoply, plate, plating, shield; cuticle, hide, skin; envelope, package, wrapper; backing, coating, coverture, facing

2 something that serves as a protective barrier as the TV had been packed in a cocoon of Styrofoam, it arrived in one piece Synonyms buffer, bumper, cushion, cushioning, fender, padRelated Words baffle, muffler; padding; safeguard, shield; barricade, cordon