TransHab was a program pursued by NASA in the late 1990s to develop the technology for expandable habitats inflated by air in space.

[1] The name of the project is a contraction of Transit Habitat reflecting the original intention to design an interplanetary vehicle to transfer humans to Mars.

In 1999, the National Space Society issued a policy statement recommending that NASA continue R&D of inflatable technologies while ceasing development of a TransHab ISS module.

The layers were fashioned to break up particles of space debris and tiny meteorites that might hit the shell with a speed seven times as fast as a bullet.

The innermost layer, forming the inside wall of the module, was Nomex cloth, a fireproof material that also protected the bladder from scuffs and scratches.