The present invention relates to a customizable prosthesis, for instance a breast prosthesis, comprised of an outer shell, removable micro-compartments and flexible filling tubes formulated out of soft Poly (methyl 2-methylpropenoate) gel, wherein the removable micro-compartments of the prosthesis are arranged in a hierarchical layering scheme to create a prosthesis capable of undergoing modifications quickly, easily and with minimal invasiveness, while retaining a prosthesis with low specific gravity.