Aerogel is an astonishingly effective insulator, which is exactly why NASA has used it to line spacesuits. Its individual nanopores are 10,000 times thinner than a human hair, making it almost impossible for air to pass through it. Invented at Stanford University, it was adopted by NASA’s Jet Propulsion Laboratory in the 1990s, and has been travelling to and from space ever since.

Having already insulated electronics and people up in space, back on Earth aerogel is the ideal long-term solution to replacing down. And the Aerogel Puffer is the next step in our journey to bring it into clothing. The jacket combines advanced synthetic insulation embedded with particles of aerogel, with an outer shell made from a yarn so ultra lightweight that 1 kilometre of it weighs less than 1 gram.