plate 346 and the two visors are spaced by washers 348 and a central spacer 350. The upper and lower edges of the visor are closed off by light seals along its upper and lower edges as illustrated at 352 in FIG 17B and 354 in FIG 17C these figures respectively showing cross-sections of the circled areas A and B in FIG 17. Thus, when the astronaut closes the visor assembly 334, he is completely protected both against physical damage and against the intense and ultraviolet radiation from the sun existing in space and on the lunar surface. At the same time, each layer or shield 336 or 338 of the visor may be independently moved upwardly to any desired position and may be completely slid over the back of the visor assembly about pivot pins 342 when the protection is not needed and the astronaut wishes to see through the helmet more clearly.

FIG 18 is an enlarged view of the liquid cooling garment 98 of \ref{fig:figure_3}. This garment is worn by the astronaut underneath the pressure garment assembly much in the manner of long underwear and is worn in conjunction with a pair of heavy socks 356 and 358 attached thereto. The liquid cooling garment 98 may be worn by all the astronauts but is only required for extravehicular activity to provide liquid cooling when the astronaut is outside the space vehicle and exposed to the intense rays of the sun. The garment is provided at its front with a zipper 360 through which it is donned and with snap fasteners 361 for securing it to the biomedical belt 96 of \ref{fig:figure_3}. A dosmeter pocket 362 is provided in the left leg of the garment and mounted on the waist is a water line 364 comprising inlet and outlet pipes terminating at their upper ends in a double or two-way connector 366. This connector is adapted to pass cooling water both into and out of the cooling garment by way of the connector 64 of \ref{fig:figure_2}. The lower ends of the tubes 364 are connected to inlet and outlet manifolds respectively, generally indicated at 368, which in turn are coupled to Tygon tubing 370 which passes through the cooling garment and over substantially the astronaut's entire body.

FIG 19 is a diagrammatic view of the pressurization and ventilation system through the space suit of the present invention. Flow of pressurized life supporting gas, such as oxygen, is indicated by the arrows in \ref{fig:figure_19}, the light arrows indicating inward flow and the darker arrows showing the return gas flow paths. While a preferred direction is illustrated, it is understood that the air flow, if desired, may be in the reverse direction. Oxygen may enter through either one of the gas inlet connectors 56 or 58 since these connectors are on fluid communication with each other by way of an intermediate plenum 372. A similar plenum 374 joins the gas outlet connectors 60 and 62 so that the outlet may be taken from either of these connectors. A redundant connector assembly is provided so that the astronaut may attach one set of connectors to the lunar module before exiting from the space vehicle without first having to disconnect the other set from the cabin supply line. The double set of connectors is also provided so that the astronauts may be connected to each other in the event the supply to one of them for some reason fails.

Gas passes upwardly from one of the inlet connectors 56 or 58 by way of one of the noncrushable ducts 376 or 378 where it exits through vent channel 244 in the helmet ring into the vent pad 248 of the helmet shown in \ref{fig:figure_10} and downwardly over the astronaut's head onto the front surface of the helmet where it helps to defog the helmet in front of the astronaut's face. The life supporting gas is, of course, also breathed by the astronaut.

Incoming gas is also supplied from one of the inlet connectors to the torso channels 380 and 382. These channels preferably are pervious to gas along their length so that the gas is distributed to the astronaut's torso over substantially the entire length of both the torso channels to which the gas is supplied. Gas from the helmet and from the torso under pressure passes over the astronaut's body and downwardly and outwardly of the limbs as indicated by the light arrows in the drawings. The gas is returned from the hands by way of arm channels 384 and 386 to the respective outlet connectors 60 and 62. Similarly, gas is returned from the feet by way of leg channels 388 and 390 to the outlet connectors 60 and 62. The return channels 384, 386, 388 and 390 are vented adjacent the extremities so that the return gas may enter them and be conducted to the outlets. Foot pads 392 and 394 are also provided to help collect the returning gas and to ventilate the feet.

Thus, the life supporting gas (1) pressurizes the interior of the suit to a pressure of from 3 to 4 pounds per square inch, (2) provides a breathable gas to the astronaut, and (3) ventilates and helps cool the suit and removes moisture resulting from perspiration over the astronaut's entire body. Pressure gage 80 provides the astronaut with a visual indication of the pressure within the suit and a pressure relief valve 82 automatically opens when the pressure becomes too high to relieve the pressure within the suit.

FIGS 20 and 21 show the interconnecting locking rings for attaching a pressure glove, such as the glove 72 of \ref{fig:figure_4}, to the suit. FIG 20 shows the suit half of the assembly, i.e., the suit ring at the wrist of the suit sleeve, and FIG 21 shows the glove half of the metal ring attached to the glove. The suit ring is the female half and is generally indicated at 396 in \ref{fig:figure_20}. It comprises a locking ring 400 on a housing 402 to which is mounted a vent fitting 404. Locking ring 400 is provided with a pair of lock tabs 406 and 408, a lock button 410, and index marks 412 for aligning it with the glove ring of \ref{fig:figure_21}.

The glove ring is the male half and is generally indicated at 414 in \ref{fig:figure_21}. It consists of an outer race 416 on which is mounted a vent fitting 418 and an inner race 420. The rings of \ref{fig:figure_20} and \ref{fig:figure_21} are aligned by index marks and locked together in sealing relationship to join the gloves to the sleeves of the space suit. The glove ring includes a sealed bearing with inner and outer races to permit 360$^{\circ}$ of glove rotation.

The torso limb suit 114 of \ref{fig:figure_5} forms the basic garment since it provides sealing over the greater part of the body to contain the life supporting gas and also incorporates restrain mechanisms so that the astronaut may move about and perform tasks. This torso limb suit assembly is a custom-sized unit which encompasses the body exclusive of the head and hands. The integrated thermal micro-meteoroid garment 112 is laced to the torso limb suit 114 and acts as a shield for the torso and limbs against the hazards of free space and lunar regions. The pressure helmet assembly is constructed of clear polycarbonate plastic and, when secured to the torso limb suit 114, remains in fixed position. The pressure glove is basically a conformal molded bladder having a quick disconnect coupling, restraining features