Manufactured by Welson & Co. in October 1971, the unit is a cotton duck base with 3 Beta cloth pockets and is 11 x 5 inches overall.
The pockets include flaps held closed by snap fasteners; inside the flaps are dummies of the electrocardiograph signal conditioner, the impedance pneumograph signal conditioner and the electrical current converter, all made of blue-anodized metal. These instruments monitored the physiological functions of the astronaut.
The base with snap fasteners at the edges to attach to either the constant wear garment or liquid cooling garment, underneath either the intravehicular or extravehicular pressure suit.
Identification label has the part number "SEB 13100084-204" and serial number "1550."