A blanket assembly for use in at least one bay and with at least one frame member of an aircraft, the assembly including an insulation blanket. The insulation blanket includes a bay section sized and shaped to fit within the bay and of sufficient thickness to provide insulation to the bay, a return section disposed on a first side of the bay section; and a cap section disposed on a second side of the bay section, opposite the first side. The cap section is sized and shaped to at least partially cover the frame member when the cap section is wrapped around the frame member, the cap section being of sufficient thickness to provide insulation to the frame member. The bay section, the return section, and the cap section are of unitary construction.