Articles are disclosed, comprising a polymer foam layer having a first surface and an opposite second surface; a plurality of cells between the first surface and the opposite second surface of the polymer foam layer, wherein the thickness of the polymer foam layer between the first surface and the opposite second surface is 1. The holster preferably includes a two piece polymer case having an inner shell and an outer shell held together by rivets adjacent an upper opening of the case. The undercoat layer contains, as a main component, a resin obtained by polymerizing, as starting materials, an aromatic dicarboxylic acid, at least one aliphatic dicarboxylic acid having 8 or more carbon atoms, and at least one diamine having a cycloalkane structure, and further contains a metal oxide. Each media controller includes a parameter storage, a media interface circuit, a control data state machine, a command sequencer state machine, a media-side multi-mode transfer state machine, a dual-port memory, a memory controller, and a host-side transfer state machine.