Getting into a suit and the donning procedure

You’ve seen the old footage: a guy in a diaper, floating in a garage, zipped into something that looks like a refrigerator. That’s not the reality anymore. The modern spacesuit—specifically the Extravehicular Mobility Unit or EMU used on the International Space Station—is a high-performance life support shell. It’s not a piece of clothing. It’s a miniature spacecraft you wear. And getting into it takes practice, patience, and a protocol that would make a pit crew jealous.

This is the donning procedure, the real step-by-step sequence that astronauts run through before any spacewalk. If you’re here to understand how your future commute to the Moon or Mars might actually work, pay attention. This is the gear that keeps you alive.

The process starts long before the suit touches your skin. The EMU is built in layers—multiple shells that each serve a specific job. The innermost layer is the Liquid Cooling and Ventilation Garment, or LCVG. Think of it as a high-tech long underwear made of spandex and nylon, laced with a network of thin plastic tubes. These tubes circulate chilled water around your torso, arms, and legs. Without it, you’d cook inside the suit under direct sunlight, which can hit 250 degrees Fahrenheit in orbit. So the donning procedure begins with pulling on this cooling garment, which fits snug and feels like a wetsuit someone forgot to dry. You zip it up the front, then connect the fluid quick-disconnects at your waist and chest. If you don’t seat those correctly, you’re sweating out your reserves inside an hour.

Next comes the Maximum Absorption Garment—yes, the diaper. It’s a simple but critical piece of gear. A spacewalk can last up to eight hours. There are no bathroom breaks. You put it on, you move on. No one talks about it, but every astronaut knows it’s there. You strap it in place under the LCVG, and that’s the end of that conversation.

Now you’re ready for the hard shell. The suit torso is a one-piece upper body assembly made of fiberglass and aluminum, with a rigid hard upper torso that supports the arms, helmet, and backpack. You don’t step into it like a coat. You enter from the back, through a hinged hatch that swings open. This is called the waist seal. You wriggle your arms into the sleeves, which have bearing rings at the shoulders and wrists to let you rotate your arms freely in the pressurized environment. The gloves, which are custom-molded to each astronaut’s hands, are clipped on separately. Once you’re in, you seal the back hatch behind you, locking the suit closed with a metal ring that seats with a satisfying thunk. That’s the sound of your world shrinking to the size of a coffin.

With the suit closed, you have to test it. The suit is purged of air and pressurized with pure oxygen to about 4.3 psi—about a third of atmospheric pressure. You breathe pure oxygen for an hour before the spacewalk to purge nitrogen from your bloodstream. That prevents decompression sickness, the bends. Inside the suit, you can’t scratch your nose or wipe your forehead. You can’t hear much except the fans and pumps of the Primary Life Support System, the backpack that scrubs carbon dioxide, regulates temperature, and supplies oxygen. That backpack is your everything. If it fails, you have a thirty-minute emergency oxygen supply in a secondary pack on your chest.

The final steps are the helmet and visor. The helmet is a clear polycarbonate bubble that clamps onto the neck ring. Over that goes the visor assembly, which is gold-plated to reflect solar radiation and protect your eyes from unfiltered sunlight and orbital debris. You flip it down, and now you’re sealed. You can see the inside of the suit’s display panel, a small screen that shows oxygen pressure, battery life, carbon dioxide levels, and coolant loop temperatures. You check it once, then again, and then the hatch opens.

Getting into a spacesuit is not about looking cool. It’s about verifying every seal, every connection, every sensor. One loose hose, one unseated ring, and you’re dead in sixty seconds. The donning procedure takes about forty-five minutes, and that’s with a buddy checking your work. By the time you float out of the airlock, you’ve already passed a dozen small tests. The suit is a shell, yes, but it’s a shell that decides whether you come home.

So next time you see a spacewalk on a YouTube livestream, remember what it took to get that person inside that gear. It’s not a costume. It’s a survival machine, and every man who wears one earns it.