What the AxEMU Liquid Cooling Garment Is—and Why It Matters
The AxEMU Liquid Cooling and Ventilation Garment is a form-fitting inner “safety suit” that uses circulating water and controlled airflow to manage astronauts’ body heat, breathing environment, and comfort during long spacewalks on the Moon, turning advanced textile engineering into a critical layer of life support inside the spacesuit. Developed by Axiom Space and Prada, this AxEMU liquid cooling garment sits directly against the skin and will be worn on the NASA Artemis IV mission. While the outer suit shields against radiation, vacuum, and micrometeoroids, this inner layer keeps the astronaut’s body within safe limits for up to eight hours of lunar activity. It cools muscles, moves fresh oxygen, and helps remove carbon dioxide, so crew members can focus on science and exploration rather than fighting heat stress or breathing problems.
How Liquid Cooling Keeps Astronauts from Overheating on the Moon
During a lunar spacewalk, heavy exertion inside an airtight suit traps metabolic heat that cannot escape through sweat or natural air circulation. The Prada spacesuit Artemis astronauts will wear solves this with a dense mesh of narrow tubes built into the LCVG. Chilled water flows across major muscle groups, absorbing excess heat and carrying it back to the portable life-support system, which expels that heat into space. To guard against failure far from immediate rescue, the garment includes a fully redundant cooling circuit that can take over if the primary loop stops working. This approach reflects a core principle of spacesuit engineering design: any system that protects life during extravehicular activity should avoid single points of failure. Even though the plumbing is hidden, its performance sets the ceiling for how long and how hard astronauts can work on the lunar surface.
Ventilation, Breathing, and the Invisible Work of Life Support
Cooling is only half the story. In a sealed AxEMU suit, every breath adds carbon dioxide to a small volume of air that must be constantly cleaned. The LCVG supports this by hosting a separate ventilation loop that delivers fresh oxygen and helps sweep exhaled gas out of the helmet. Through dedicated tubing, oxygen flows across the astronaut’s face, creating a steady breeze that pushes carbon dioxide toward chemical scrubbers in the life-support backpack. There, carbon dioxide is removed and oxygen is recirculated. This prevents pockets of CO₂ from forming around the mouth and nose during demanding tasks. According to Axiom Space’s Russell Ralston, “Every minute astronauts spend outside their vehicle, the LCVG is working to keep them safe.” Stable ventilation is as vital as temperature control to prevent dizziness, fatigue, and impaired decision-making during long Artemis moonwalks.
Where Prada’s Fashion Engineering Meets Spacesuit Design
Prada’s role goes beyond adding a luxury label to the AxEMU liquid cooling garment. The company brought fashion-focused engineering—like advanced 3D modeling and engineered knitting—to build a single, continuous layer that fits close to the body without bulky seams. This smooth construction increases range of motion and helps cooling tubes stay in close contact with skin and muscle, improving heat transfer. It also reduces pressure points that could become painful during eight-hour excursions. Axiom and Prada first worked together on the AxEMU’s outer layer, then moved inward to this more demanding inner suit. As Axiom CEO Jonathan Cirtain explained, “By bringing together the best in both aerospace engineering as well as luxury craftsmanship and advanced product development, we have developed a garment that neither company could have created independently.”
Artemis IV and the Future of Spacesuit Engineering
NASA Artemis IV mission plans call for more ambitious and sustained lunar exploration than Apollo, which means spacesuits must function as wearable spacecraft for longer and more demanding spacewalks. The AxEMU LCVG is tuned for excursions of up to eight hours, balancing thermal control, ventilation, and mobility so astronauts can travel farther and work harder on the surface. Its redundant cooling circuits and dedicated breathing loop match a broader Artemis philosophy: mission-critical systems should not rely on any single component to keep crew members safe. As lunar stays lengthen and science goals grow, spacesuit engineering design will depend even more on cross-disciplinary partnerships. The intersection of Axiom’s aerospace systems and Prada’s textile innovation hints at a future where high-performance space gear looks less like bulky armor and more like precise technical clothing built to live in another world.
