A process and related system and computer program product for constructing a personalized contacting interface for a facial mask, comprising the steps of: providing a three-dimensional (3D) reference model representative of a human face； identifying in the reference model a desired contact area circumscribing one or more facial regions； generating a digital design model of a contacting interface, the digital design model having a perimeter configured to provide a continuous air seal along the desired contact area of the reference model； receiving a 3D facial target model corresponding to the face of a subject； performing an elastic transformation of the reference model to conform the reference model to the target model； modifying said perimeter of said digital design model based on the deformed reference model； and using said modified digital design model to generate a set of manufacturing instructions for a contacting interface personalized for said subject.
