Abstract: Breathable residual-limb system that admits air and allows sweat to evaporate from the surface of the residual limb. In an embodiment, the system comprises a liner sock to be worn on the residual limb, and 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. The liner sock further comprises a friction-interface material that covers only a portion of the internal surface of the air-permeable textile, such that, when worn on the residual limb, the friction-interface material 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.

Abstract: Systems and methods of the present disclosure enable hybrid physical-digital activities using a processor of a platform to receive an electronic record recording at least one specified value and at least one physical item having at least one item value. A difference between the at least one specified value and the at least one item value is determined. A first profile associated with the first device is identified, and a token representing the first profile and at least one digitized item associated with the difference is generated. The token is transmitted to the first device. The token is then received from a second device. A second profile associated with the second device is determined, and the at least one digitized item is transferred from the first profile to the second profile based at least in part on the token.