Breathable residual-limb socket system

A system for use on a residual limb, the system comprising:

• a liner sock configured to be worn on and contact the residual limb, the liner sock comprising:
• air-permeable textile forming a substantially cylindrical portion that is closed on a distal end and open on a proximal end and comprising an internal surface and an external surface;
• and
• a friction-interface material that covers only a portion of the internal surface of the air-permeable textile, wherein the friction-interface material defines an inner surface of the liner sock such that, when worn on the residual limb, the friction-interface material directly contacts a surface of the residual limb, and an uncovered portion of the air-permeable textile which the friction-interface material does not cover allows air to pass between an external environment of the liner sock and the surface of the residual limb, wherein the friction-interface material comprises a plurality of strips that are spaced from each other to define the uncovered portion of the air-permeable textile therebetween,
• wherein the air permeable textile comprises:
• a first section comprising unidirectional-stretch textile;
• and
• at least one second section comprising bidirectional-stretch textile,
• wherein the first section is fixed to the at least one second section by at least one seam, and
• wherein the friction-interface material covers the at least one seam on the internal surface of the air-permeable textile.