Cotton fabric military specification mil-f-4143, type i, sea blue, 17.00 in. W, 18.000 in. H, three layers of insulation 0.500 in. Thk fiber glass fastened to inside wall, cover to be marked w/sperry trade mark, mk 23 gyro compass, w/white characters, all parts including thread and slide fastener flaps to be fungus resistant and mildew proofed
