The key difference between X1 and other exoskeletons in development is the safety factor, Radford said.
Robonaut's software had to be extremely reliable for NASA to agree to fly the droid on the station where it operates alongside the crew.
"We essentially took all of that broad technology portfolio we had created with Robonaut and we re-purposed it into the X1 device. When a user has it on, you have this sense of safety that the device isn't going to rip your leg off or something," Radford said.
Another difference is NASA's emphasis on X1 as a fitness device.
"We can have a device that can help somebody walk, but we also can have that exact same device be used on the space station to help the astronauts maintain their health and their bone density and their muscles from atrophying," Radford said.
"Robotics will be critical in our future human exploration of deep space," Michael Gazarik, director of NASA's space technology program, added in a statement.
NASA, which has spent about $1.3 million developing X1, is considering flying the device on the space station. A next-generation exoskeleton, called X2, is in the planning stages, Radford said.