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This subject is from the Portal 2 era.
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"Gentlemen, I give you the Long Fall Boot. Think of it as foot-based suit of armor for the Portal Device. I'm not gonna lie to you, it's expensive as hell. But check this out: we told this Test Subject to just go ahead and try to land on her head. Heh heh! She can't do it! Good work, boots."
Cave Johnson[src]

The Long Fall Boot is a boot used by Aperture Science to prevent Test Subjects from inadvertently damaging the Portal Device while falling to their death. It does this by lessening the impact of falls, thus also preventing injury to test subjects.


During the testing of the Portal Device, the observers came across a reproducible human error - due to the conservation of momentum when traveling through a portal, Test Subjects would reach great heights, only to fall and die on impact with the Test Chamber Floor. As Test Subjects were prone to flailing uncontrollably when faced with their imminent demise, they would often drop the Portal Device, which would be damaged upon hitting the ground. The equipment was expensive and was costing Aperture Science time, money and manpower, so Cave Johnson devised the Long Fall Boot as a solution to the problem of falls from height leading to broken equipment. The Long Fall Boot is a new iteration of Aperture's Advanced Knee Replacement for Portal 2. Ironically, the Long Fall Boot, despite being devised as a way to save costs in the long run, was itself extremely expensive to develop and produce, with Cave Johnson admitting in a demonstration video that the Long Fall Boot was "expensive as hell" and that Aperture Science was "between banks" as a result of the costs.


  • The Long Fall Boot may be installed with a gyroscopic mechanism of some kind, as the boots aid the test subject in balance and keep them from landing on their heads when falling through or exiting portals. This feature is mentioned by Cave Johnson and demonstrated by Chell in Aperture Investment Opportunity #4: "Boots".
  • When a test subject wearing the boots falls from a height that would require the boots to kick in, lest the equipment be damaged, they will make a sound similar to hydraulics moving.
  • They are capable of surviving truly long falls, up to and possibly beyond the subject's terminal velocity, as it appears when Chell falls four kilometers down to old Aperture Science and falling into a portal until reaching terminal velocity.
  • While falling down the elevator shaft, GLaDOS makes a joke on how merely one boot could protect the user, though given her deceptions, it is unlikely.


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