A prosthetic liner for forming an interface between a prosthesis socket and a residuum to be accommodated in the prosthesis socket. The prosthetic liner including a proximal region with a proximal end and a distal region with a distal end and being provided with a closed-cross section with a proximal opening through which the residuum in inserted into the prosthetic liner. The internal contour has at least on one lateral side of the prosthetic liner a greater pitch from distal to proximal in the proximal region than in the distal region.
