In microgravity, astronauts need hand rails, foot holds, and work area restraints. In gravity, astronauts may need safety railings, steps or ladders, particularly for large, multi-deck habitats. NASA needs a common solution: a single system that will restrain crew members in microgravity, while being unobtrusive in gravity; that will enable astronauts to translate between decks on the Moon or Mars, but not be a passageway obstruction in microgravity. The same system must be effective in any gravity field: 0g, 1/6g, 3/8g, and 1g with no reconfiguration.