The Story of NASA’s Troubled Spacesuits…

Key Takeaways

• ISS spacewalks still rely on suit hardware whose design dates back to the 1970s
• NASA shifted from building suits itself to buying spacesuit services from industry
• Lunar suit delays now affect station planning, mission pacing, and vehicle compatibility

NASA Spacesuits Still Depend on Shuttle-Era Hardware

On April 20, 2026, the NASA Office of Inspector General released a new audit that made one point unavoidable: NASA spacesuits remain one of the agency’s hardest human-spaceflight problems. The suits used outside the International Space Station are still the Extravehicular Mobility Unit, or EMU, a system whose design lineage reaches back to the 1970s. Those suits made their spacewalk debut during a 1983 Space Shuttle mission, and the 2026 OIG audit states that astronauts had completed 203 ISS spacewalks in EMUs as of March 2026. That figure says a lot about the suit’s value. It also says a lot about NASA’s dependence on hardware that long ago exceeded its intended 15-year design life.

Age by itself does not make a suit unsafe. Space hardware can serve for decades when parts are replaced, inspected, and requalified. The problem is that the EMU is not a simple garment. It is a compact survival system with pressure layers, power, oxygen, cooling, carbon dioxide removal, hydration, displays, and communications packed around one person. The 2025 OIG audit on ISS spacesuits found that as of July 2025, NASA and Collins Aerospace were tracking 11 important Primary Life Support System components with no non-allocated spares on the ground, and seven of those had two or fewer spare units in total. That is a small cushion for a system that must keep working during station maintenance, solar array work, and emergency repairs.

Trouble in the suit fleet has not stayed abstract. The same OIG review described a March 2022 helmet water incident that led NASA to pause spacewalks until the agency finished its investigation and mitigation work. The report also pointed to delayed sublimators, delayed carbon dioxide sensors, and persistent manufacturing and quality problems in replacement parts. NASA’s contractor for station suit maintenance, Collins Aerospace, has had to support a fleet whose parts are harder to source and harder to qualify each year. By the OIG’s account, Collins overran its cost plans by nearly 15 percent across the prior three fiscal years, a total of $34 million, and some parts ran far past their original budgets. The station program still has workable spacesuits, but it does not have abundance, and abundance is what lowers operational stress.

Replacement Programs Consumed Time Before xEVAS Began

The present situation did not emerge because NASA ignored the problem. The agency has spent years trying to replace or modernize its suits, and those efforts left behind technical knowledge, hardware, and cautionary lessons. A 2017 OIG audit found that NASA had already spent almost $200 million across three development efforts, including the Constellation Space Suit System, the Advanced Space Suit Project, and the Orion crew survival system. Four years later, the 2021 OIG audit concluded that NASA had spent more than $420 million on next-generation suit design and development and was on track to exceed $1 billion before the first two upgraded suits would be ready. That history matters because it shows that the present delay is not the result of one bad year or one missed milestone. It is the product of repeated program resets, shifting architectures, and a mismatch between suit difficulty and schedule promises.

The in-house Exploration Extravehicular Mobility Unit, or xEMU, was the most visible of those attempts. NASA engineers at Johnson Space Center used it as a government reference design, and the work fed later commercial efforts through data, facilities, and personnel support. A 2025 NASA technical paper explains that the xEMU pressure garment and related hardware continued to support integration work, training plans, and test infrastructure even after NASA changed course on procurement. That meant xEMU was not wasted work. Yet it also meant NASA reached the 2020s without a flight-ready suit for either lunar service or ISS replacement. By March 2023, NASA had moved from trying to deliver the whole suit itself toward buying suit services from industry. The agency preserved some of the technical base, but it also admitted through its actions that a government-built replacement had not reached operational use in time.

Lunar Surface Operations Demand More Than an Updated EMU

A common assumption holds that NASA mainly needs a fresher version of the station suit. That is too small a view of the problem. A microgravity suit for work outside the ISS and a lunar surface suit for operations near the Moon’s south pole share some functions, but they do not serve the same environment. The 2026 OIG audit notes that lunar suits must support walking, crouching, kneeling, and sample collection in reduced gravity, something the station suit does not have to do. The audit also says new lunar suits are expected to carry improved data links, high-definition video, integrated communications, and stronger protection against lunar dust contamination. A suit built for anchored handrail work outside an orbiting station cannot simply be repainted and sent to Shackleton crater.

The Moon adds a materials problem that Apollo crews knew well and NASA still studies today. Lunar regolith hazards include abrasive grains, static cling, seal wear, and possible respiratory exposure after dust rides back inside a spacecraft. NASA’s Moon dust research ties those hazards to astronaut reports from Apollo, including eye, nose, and throat irritation after dust entered the cabin. Dust also wears surfaces, clogs mechanisms, and can interfere with thermal control. That is one reason the current Axiom lunar suit description stresses dust-tolerant features and mobility improvements rather than simple continuity with earlier designs. Axiom also says the suit has broader sizing adjustability and greater range of motion, reflecting a modern requirement that the lunar program serve more body types than the narrow fit window that shaped much of the early U.S. EVA era. NASA’s suit problem is not only about replacing aging hardware. It is about fielding a different class of hardware for a different place.

A Service Contract Changed Ownership and Shifted Risk

NASA’s major policy shift came in 2022 with the Exploration Extravehicular Activity Services, or xEVAS, contracts. When NASA announced the awards in June 2022, the combined maximum potential value was $3.5 billion across all task orders. By the time the 2026 OIG review was published, the current combined maximum value stood at $3.1 billion. More important than the ceiling value was the operating concept. NASA would no longer buy and own the suit hardware in the old way. Under xEVAS, the agency would buy spacewalking services after an initial demonstration, in effect paying providers to furnish suit capability rather than taking title to every suit and subsystem itself.

That change sounds tidy in acquisition language, but the OIG argues it created a harder management problem than NASA’s recent human-spaceflight service contracts. The 2026 audit says NASA chose a firm-fixed-price, service-based contract structure even though next-generation spacesuits carry high technical, financial, and schedule risk, and even though officials inside and outside the agency acknowledged there was effectively no commercial market for spacesuits before xEVAS. A 2025 NASA technical paper adds an important detail: NASA made the complete xEMU reference design, NASA testing facilities, and NASA xEMU personnel available to vendors. That softened the transition, but it also meant xEVAS was never a simple commercial handoff. NASA was still deeply involved, just under a different ownership model. The contract structure shifted cost exposure toward the companies on paper, yet mission exposure stayed with NASA because the agency still carries crew safety, schedule integration, and program accountability.

Collins Left the Development Race and Axiom Became the Sole Active Provider

NASA intended xEVAS to preserve competition by selecting two providers. The commercial spacesuit providers page and later task-order announcements showed how that split was meant to work. Collins Aerospace received a December 2022 task order with a base value of $97.2 million to deliver a next-generation station suit and support system. In August 2023, NASA also announced additional task orders worth $5 million each to develop more suit capability in low Earth orbit and on the lunar surface. The idea was simple enough: preserve at least two paths to new EVA hardware so NASA would have redundancy, schedule resilience, and some pricing discipline.

That structure broke down in 2024. NASA stated in its June 26, 2024 update that it and Collins had mutually agreed to descope the company’s xEVAS task orders after determining the development timeline would not support station needs or mission objectives. The 2026 OIG report says NASA had already paid Collins $37 million across four milestones before the descope and received no flight hardware for that investment, though it did retain conceptual design data. From that point forward, Axiom became the sole active xEVAS provider for both lunar and microgravity suit development. Axiom has posted real progress, including a November 2025 uncrewed thermal vacuum test and more than 700 hours of crewed pressurized suit time reported by the company during ongoing qualification work. Still, sole-provider status changes the tone of the program. NASA can no longer count on parallel development lines to absorb a slip, and every Axiom schedule problem now has agency-wide consequences.

Artemis Mission Changes Moved the Landing Date but Not the Suit Problem

The suit schedule cannot be read in isolation from the rest of Artemis, and the Artemis plan itself changed during early 2026. On February 27, 2026, NASA announced a refined mission architecture that added a 2027 demonstration mission in low Earth orbit. NASA’s current Artemis III mission page now describes Artemis III as a rendezvous and docking test in Earth orbit with one or both commercial landers rather than the first landing mission. NASA’s Artemis program overview says the first Artemis lunar landing is now targeted for early 2028 on Artemis IV. That shift matters because many older discussions, including some 2025 program material, still tied lunar suit readiness to an Artemis III landing concept that no longer exists.

Yet the schedule pressure did not disappear when the mission labels changed. The OIG’s 2026 audit says NASA’s original plan to demonstrate lunar and microgravity suits in 2025 and 2026 proved unachievable. As of January 2026, Axiom was targeting late 2027 demonstration readiness for both suits, a slip of more than a year and a half for each. The same audit compared the xEVAS development timeline to recent NASA flight programs and found the original suit schedules were less than half the 8.7-year historical average from contract award to test flight. The OIG stopped short of predicting a 2031 operational date as a firm forecast, but it said that if Axiom’s experience follows those historical averages, demonstration missions could drift to 2031. NASA’s Artemis II mission did fly around the Moon in April 2026 and concluded on April 10, proving that the broader exploration stack can move ahead. The suits remain one of the pacing items that could still slow the first lunar surface stay under the revised plan.

Interoperability Across Lunar Vehicles Remains Unsettled

Even if Axiom delivers on its current schedule, NASA still has a design-integration problem that receives less public attention than the delay headlines. The 2026 OIG audit says NASA does not yet contractually require a single, universally adopted standard for suit interoperability across Artemis hardware. That is a larger issue than hatch dimensions. The suit has to interface with landers, airlocks, displays, communications, power provisions, donning hardware, and later with mobility systems such as the Lunar Terrain Vehicle and future pressurized rovers or habitation modules. A suit optimized around one vehicle family can become awkward or expensive to adapt somewhere else.

The same audit points to a real example. According to the OIG, if NASA wanted the current Axiom suit to work with Blue Origin’s Blue Moon lander architecture, the provider might need to alter the airlock layout or create separate donning and doffing hardware to support the Axiom interface approach. NASA’s March 2026 architecture update makes that issue more pressing because the agency intends to fly more often and use more than one commercial lander line. Outside NASA, the Polaris Dawn mission already showed that commercial EVA systems are beginning to branch into their own suit families, with SpaceX suit work reaching the first commercial spacewalk in September 2024. More providers and more vehicles can be good for resilience. They can also multiply interface mismatches. The OIG recommended that NASA develop a plan for interoperability standards by the end of 2027. That recommendation may prove as important as any single milestone in the Axiom test calendar, because a suit that fits only one vehicle cleanly is not a strong foundation for a multi-provider lunar program.

Summary

NASA entered April 2026 with three suit realities at once. The ISS still depends on EMUs whose design roots reach back to the Shuttle era. The lunar program still needs a new generation of EVA hardware that can handle dust, mobility, longer surface work, and integration with more than one class of spacecraft. The agency has also moved from government-led suit development to a service model that leaves NASA buying capability from industry rather than owning the suits in the older way. Each of those choices can be defended on its own terms. Taken together, they have produced a program with little slack.

The strongest reading of the current evidence is not that NASA has failed to make progress. It has. Axiom’s test campaign is real, Artemis architecture has been adjusted to buy time, and NASA still has a deep technical bench in Johnson Space Center and across its contractor base. The harder judgment is that the suit problem was harder than NASA’s schedules admitted, and the 2026 OIG report states that directly. NASA now has less competition than planned, less schedule margin than it would want, and more interface management to do across the lunar system than many public discussions assume. Spacesuits sit at the point where human safety, procurement policy, station sustainment, and lunar operations meet. That makes them one of the best windows into how NASA’s next era of exploration is actually being built.

Appendix: Useful Books Available on Amazon

• Spacesuit: Fashioning Apollo
• Spacesuits
• US Spacesuits
• Spacesuit: A History Through Fact and Fiction
• The Spacesuit

Appendix: Top Questions Answered in This Article

Why is NASA still using older ISS suits?

NASA still relies on EMU suits because replacement systems have not yet completed development, qualification, and demonstration. The existing suits remain usable through inspection, refurbishment, and part replacement, even though their design dates back decades. That keeps station spacewalks possible, but it also raises maintenance pressure and inventory risk.

What makes a lunar suit harder to field than a station suit?

A lunar suit must handle walking, kneeling, dust exposure, surface tool use, wider thermal swings, and long periods away from a spacecraft. A station suit mainly supports work in microgravity, where leg mobility and dust sealing matter less. Those different demands drive different materials, joint designs, seals, and life-support margins.

What does xEVAS change for NASA?

Under xEVAS, NASA buys spacewalking services from commercial providers instead of owning the suit hardware in the old way. The provider develops, maintains, and supports the suit system, and NASA pays for the service after demonstrations and later task orders. That changes contract incentives, technical oversight, and long-term support planning.

Why did Collins leave the new suit effort?

NASA and Collins agreed in 2024 to remove Collins’ xEVAS task orders after deciding the development timeline would not support station needs or mission goals. Collins still supports legacy ISS suit maintenance under a separate contract. The descope reduced competition and left Axiom as the only active xEVAS provider.

Is Axiom behind schedule?

The OIG says the original schedules for both lunar and microgravity suit demonstrations were too aggressive and slipped by more than a year and a half. Axiom has completed meaningful test work, including pressurized runs and a thermal vacuum test, but formal readiness still depends on more design, qualification, and integration work.

Did NASA waste the money spent on xEMU?

The in-house xEMU effort did not produce an operational flight suit, but it did leave behind technical data, facilities, test methods, and a reference design that supported later commercial work. That means the investment was not empty. It does mean NASA paid a large amount before reaching routine operational use.

How do suit problems affect Artemis mission timing?

Suit readiness can shape when astronauts are able to land and work on the Moon, because the suit is a mission-enabling system rather than an accessory. NASA changed its Artemis architecture in 2026 and moved the first lunar landing target to Artemis IV in early 2028. Even with that adjustment, suit timing remains a pacing factor.

Why does interoperability matter so much?

A suit has to work with the spacecraft and surface hardware around it, including airlocks, hatches, life-support interfaces, and mobility systems. If each vehicle family uses different assumptions, integration becomes slower and more expensive. Common interface standards reduce risk and make rescue or backup options easier.

Are the current ISS suits unsafe to use?

NASA continues to use the current station suits for spacewalks, so they are not treated as unusable. The concern is that sustaining safe use gets harder as parts age, spares shrink, and replacements arrive late. Safety in this context depends on maintenance discipline, inventory depth, and conservative flight rules.

What is the main lesson from the OIG reports?

The main lesson is that spacesuits behave more like spacecraft than clothing in cost, schedule, testing burden, and integration demands. Programs that treat them as simpler systems are likely to promise dates that do not hold. The NASA OIG argues that procurement choices, schedule assumptions, and interface standards all need tighter alignment with that reality.

Appendix: Glossary of Key Terms

Extravehicular Mobility Unit

Used by NASA crews for station spacewalks, this is the long-serving U.S. suit system developed for reusable work outside spacecraft. It combines a pressure garment, backpack life support, cooling hardware, communications gear, and emergency oxygen into one assembly worn by the astronaut.

International Space Station

Orbiting Earth as a permanently crewed laboratory, this outpost supports science, maintenance work, and long-duration human-spaceflight operations. External repairs and upgrades often require astronauts to leave the station in suits, making EVA hardware a permanent operational need.

Primary Life Support System

Mounted like a backpack on the suit, this assembly supplies breathable oxygen, electrical power, cooling, humidity control, and carbon dioxide removal during a spacewalk. Because it performs the functions that keep the astronaut alive outside the vehicle, spare parts and refurbishment cycles matter greatly.

Exploration Extravehicular Mobility Unit

Created by NASA as a government reference design, this program represented the agency’s attempt to build a next-generation exploration suit in-house before procurement strategy changed. Its hardware, data, and test methods still support later commercial suit work.

Exploration Extravehicular Activity Services

Known as xEVAS, this contract approach pays commercial providers to deliver spacewalking capability as a service rather than selling NASA the suit hardware in the traditional way. The provider keeps ownership of the suit system and supports development, maintenance, logistics, and operations.

Lunar Regolith

Covering the Moon’s surface as a layer of fine, broken rock and dust, this material is abrasive, clingy, and damaging to seals, fabrics, and moving parts. It also raises health concerns when carried into a cabin and breathed by crew members after surface activity.

Neutral Buoyancy Laboratory

Located near NASA Johnson Space Center, this giant pool allows crews and engineers to rehearse spacewalk tasks in a submerged environment that approximates some features of weightless motion. Suit developers use it for fit checks, task trials, and integration work before flight.

Interoperability Standard

Applied to hardware interfaces, this is a common set of rules that allows equipment from different providers to work together. For spacesuits, it affects whether one suit can function smoothly with multiple landers, airlocks, rovers, and surface systems without major redesign.

Sublimator

Serving as part of the suit thermal-control chain, this device removes heat by allowing water to change state in a controlled way. Delays in producing replacement units matter because thermal regulation is one of the functions that keeps the astronaut physically stable during a spacewalk.

Artemis Architecture

Describing how NASA sequences missions, vehicles, landers, and support hardware, this plan defines the order in which astronauts return to lunar orbit and the Moon’s surface. Changes in that architecture can reshape when suits need to be demonstrated and how they must interface with other systems.