How SpaceX's New Spacesuit Solves What NASA's Lunar Suit Impossible!

SpaceX is developing what could be the most advanced lunar space suit ever built, its EVA suit. Compared to Axiom Space's AxiomU, the suit developed under NASA's requirements, SpaceX's design is often seen as more practical, more modern, and clearly ahead. It's built to meet the toughest standards in human spaceflight, and it even breaks away from a design approach that has remained largely unchanged for over 50 years. So, what exactly makes SpaceX's EVA suit stand out from Axiom's AxiomU? Let's break it down in today's episode of AlphaTech. Back in the last century, when technology was far less advanced, the 12 astronauts who walked on the moon during the Apollo missions all wore the same space suit, the A7L. It was often described as a kind of mini-tank, and surprisingly it was hand-sewn by a team of underwear seamstresses. The reason people compared it to a tank becomes clear once you picture what the suit was actually like. It was built from 13 to 21 layers of fabric, all carefully stitched together by hand. Once the suit was pressurized, it became incredibly stiff. Moving inside it was anything but easy. On top of that, astronauts also carried the PLSS life support backpack, which weighed nearly 100 pounds on Earth. Altogether, the full suit system came in at roughly 180 to 250 pounds. And despite all that the thickness and weight, the suit still had serious limitations during real lunar missions. Harrison Jack Schmidt, the only professional geologist ever to walk on the moon, was especially blunt about it. After returning to the lunar module, he suffered what he later described as Lunar Dust Hay Fever. The dust irritated his nose, his face swelled up, and his voice turned hoarse. It stuck to everything, increased friction, damaged the suit's outer layers, and even jammed the joints, he said. Years later, even at the age of 90, Schmidt still looked back on that experience and said, very plainly, Physically, and from a suit maintenance standpoint, that was probably the limit. And that's exactly why, nearly 50 years later, we need a better generation of spacesuits. Something that can overcome the limitations of the old A7L design, not just to prove that technology has moved forward, but also to give astronauts the comfort and protection they'll need for the missions ahead. Because the next time humans return to the moon, the goal is not simply to repeat what happened during Apollo. This time, the objective is far more ambitious. We are talking about laying the foundation for long-term infrastructure on the lunar surface. Building permanent outposts, constructing facilities like Moonbase Alpha, even deploying nuclear power systems. These are demanding tasks, and they require a suit that is safe, comfortable, and efficient for astronauts working in that harsh environment. In that context, two suits are currently emerging as the most serious contenders. The first is the AxiMU suit, developed by Axiom Space. It has been undergoing extensive testing since 2024 in preparation for the Artemis program missions, particularly Artemis IV. The second is the SpaceX EVA suit, a new Challenger design with an iterative approach aimed at future exploration. At first glance, placing these two suits side-by-side reveals a clear visual difference. The AxiMU design includes the familiar PLSS backpack, which immediately makes it look more suited for long-duration work on the lunar surface. The SpaceX EVA suit, on the other hand, does not include that backpack. Its appearance is much simpler, more modern, what the clean, black-and-white aesthetic SpaceX is known for. But appearances can be misleading, so let's take a closer look. The SpaceX EVA suit is essentially an evolved version of the IVA suit astronauts wear inside the spacecraft. This is the suit we often see when crews launch and return aboard Crew Dragon on missions to the International Space Station. Because of that heritage, the EVA suit keeps the same overall design language. A slim profile, the signature black-and-white color scheme, and a streamlined look. But it also adds several key upgrades so it can operate in the vacuum of space. For example, the thermal management system has been significantly improved, using advanced fabrics inspired by materials used on the interstage of Falcon 9 and on the Dragon spacecraft itself. The helmet has also received a major upgrade. It now includes a heads-up display that provides astronauts with real-time data, such as pressure temperature, humidity, and mission time. The helmet also features a high-definition camera and an advanced visor designed to reduce glare. One of the most distinctive aspects of this suit is that it does not carry a standalone P-LSS backpack. Instead, it uses a tethered system connected to the spacecraft through an umbilical line that supplies oxygen power and cooling. The first real test of this suit came during the Polaris Dawn mission in September 2024. Led by Jared Isaacman, the crew successfully carried out the world's first commercial spacewalk. The tethered EVA lasted around two hours and took place at an altitude of nearly 740 kilometers above Earth. During the operation, the suit performed reliably. It maintained stable pressure, allowed good mobility, and the helmet display proved useful for the crew. Most importantly, no major technical issues were reported. Of course, this is still essentially a first-generation system, something close to a minimum viable product. But for SpaceX, it represents an important milestone and a crucial step toward a design that could eventually scale to future missions like Mars, for example. So, what about the Axiom U spacesuit from Axiom Space? At the moment, it clearly holds an advantage over the SpaceX EVA suit. The reason is simple. Axiom U is no longer in an early experimental phase. In February 2026, the suit successfully completed an internal technical review confirming that the design had stabilized in terms of configuration, interface, and performance. Next, NASA will conduct an independent critical design review to verify that the suit is ready for its final testing phase certification and eventually large-scale production before delivery. Things get even more interesting when you look at the system itself. Unlike the tethered design used by the SpaceX EVA suit, Axiom U is a fully self-contained system. It carries its own PLSS backpack weighing around 45 kilograms. That backpack handles all of the astronaut's life support functions. It supplies oxygen, removes carbon dioxide, regulates temperature, and most importantly, maintains stable internal pressure to protect the human body. And that pressure is absolutely critical. Our bodies are adapted to Earth's atmospheric pressure of about 14.7 pounds per square inch. In a vacuum without external pressure, the pressure inside the human body would cause bodily fluids such as blood saliva, tears, and sweat to begin boiling at body temperature around 37 degrees Celsius. This phenomenon is known as ebolism. Gas bubbles form in the bloodstream, the lungs can no longer exchange oxygen properly, and the body begins to swell dramatically. A space suit prevents all of that by maintaining a stable pressurized environment around the astronaut. The SpaceX EVA suit can also provide pressure protection, but it relies heavily on the spacecraft because it remains connected through an umbilical system. In other words, the suit is still partially dependent on the vehicle supporting it. Because of that, when you compare it directly with the SpaceX suit, the Axiom design is far better suited for actual lunar surface operations. For example, Axiom U is designed to support spacewalks lasting up to 8 hours, while the tethered EVA suit used on Polaris Dawn supported roughly 2 hours of activity. Even more importantly, the suit was designed from the beginning to integrate with Starship HLS, following the demanding development roadmap set by SpaceX. According to the current design, when astronauts are inside Starship HLS, the suits will be mounted on dedicated racks. From there, the spacecraft's internal systems will connect directly to the suits in order to perform several key functions. First, refill operations. The system can replenish oxygen and cooling water inside the PLSS backpack after each spacewalk. Second, battery charging. Power is supplied to recharge the suit's electronics and biometric monitoring systems. For astronauts preparing for repeated lunar excursions, that kind of integration could make operations much more efficient. But in return, the SpaceX EVA suit stands out for its simplicity and ease of use. It uses a spiral zipper along the body, creating a wide opening so astronauts can put it on by themselves without much assistance. In most cases, suiting up takes about 10 to 30 minutes, sometimes even faster once they get used to it. The Axiomu space suit from Axiom Space is quite different. The system is far more complex and usually requires assistance during the suit-up process. In some cases, it can take up to 45 minutes to fully prepare the suit since every seal and connection must be carefully checked. And that factor of time actually matters more than you might think. Imagine spending nearly an hour just trying to get into a complicated suit before the real work even begins. That kind of process can quickly become exhausting. Because of that, the Axiomu design is better suited on the lunar surface. Tasks like traveling farther away from the lander, collecting samples, or assembling infrastructure. In those situations, the suit-up time is not the main bottleneck. Meanwhile, the SpaceX EVA suit with its spiral zipper design could be far more convenient for day-to-day activities inside a lunar base. Astronauts could put it on quickly when needed, whether for short transitions, system checks, or quick adjustments without wasting too much time preparing. In the end, both designs may end up playing important roles in future lunar missions. Each one solves a different operational problem, and together they reflect how human space exploration is evolving for the next era of moon exploration. But there is one uncomfortable truth that still remains. Even today, NASA does not have a real capability to rescue astronauts if they become stranded on the lunar surface during a life-threatening emergency. And this situation actually has a very clear historical precedent. On July 18, 1969, William Safire, the speechwriter for Richard Nixon, prepared a contingency speech that would have been delivered on national television if the Apollo 11 mission had ended in disaster. Specifically, if Neil Armstrong and Buzz Aldrin had been unable to leave the moon. The speech opened with a line that later became famous, Fate has ordained that the men who went to the moon to explore in peace will stay on the moon to rest in peace. The message honored the astronauts' sacrifice and expressed hope for humanity through their courage. Fortunately, Apollo 11 succeeded, and that speech was never delivered. It later became known as one of the most famous speeches that was never actually read. But it also revealed something important. Even during the Apollo era, NASA had no real contingency plan to rescue astronauts if they became stranded on the moon. A similar concern still exists today in the current Artemis program. A report from NASA's Office of Inspector General found that while the agency has tried to reduce risks associated with the human landing system developed by SpaceX and Blue Origin, there are still gaps in the overall risk mitigation strategy. One of the most notable points is that NASA has effectively ruled out developing a dedicated crew rescue capability for the early crewed missions. In other words, if a serious failure were to leave astronauts stranded on the moon, or even in deep space, there is currently no vehicle and no operational plan ready to bring them safely home.