This effect is used in adjustable casts (these modern plastic ones that you get when you break your foot) and vacuum stretchers for people with a suspected spin

This effect is used in adjustable casts (these modern plastic ones that you get when you break your foot) and vacuum stretchers for people with a suspected spine injury(+). They’re essentially a bag filled with tiny foam pellets that adjusts to your foot/body shape and turn rock solid once you pump out the air. (+) https://www.rusunsafety.com/VacuumMattressStretcher/ https://www.rusunsafety.com/VacuumMattressStretcher/