This video follows the ICRC's process of fabricating a trans-tibial prosthesis for an amputee - from the first measurements, through to the final check. The prosthesis is made from polypropylene, a material which is cheap, recyclable and easy to obtain and store - for the amputee, the finished prosthesis is light and strong. This process has been standardised so that amputees in Cambodia and other war-affected countries can have their prostheses repaired or adjusted in workshops operated by other organisations.