An article of footwear, comprising: an upper, the upper comprising a plantar section, side sections (32, 33), and a dorsal section, the plantar, side (32, 33) and dorsal sections defining a void; a support surface located in a bottom of the void and having a top side, the support surface top side having a plurality of upwardly open cavities formed therein; and a sock liner within the void and resting on the top side of the support surface, wherein a bottom of the sock liner includes downwardly extending tabs, each of the tabs extending into a corresponding one of the cavities; characterized in that: the support surface is a chassis, the chassis comprising: a base having a peripheral edge, the peripheral edge having a footwear sole shape; and a frame disposed at a top side of the base and comprising a network of interconnected walls defining a plurality of cells, each of at least a portion of the cells having a bottom at least partially closed by an underlying portion of the base, wherein a first set of the cells is located in at least a heel region, each of the cells of the first set being oriented with its major axis pointing forward and laterally, and a second set of the cells is located in at least a portion of a forefoot region, each of the cells of the second set being oriented with its major axis pointing forward and medially, wherein the plurality of cells corresponds to the plurality of cavities. an upper, the upper comprising a plantar section, side sections (32, 33), and a dorsal section, the plantar, side (32, 33) and dorsal sections defining a void; a support surface located in a bottom of the void and having a top side, the support surface top side having a plurality of upwardly open cavities formed therein; and a sock liner within the void and resting on the top side of the support surface, wherein a bottom of the sock liner includes downwardly extending tabs, each of the tabs extending into a corresponding one of the cavities; characterized in that: the support surface is a chassis, the chassis comprising: a base having a peripheral edge, the peripheral edge having a footwear sole shape; and a frame disposed at a top side of the base and comprising a network of interconnected walls defining a plurality of cells, each of at least a portion of the cells having a bottom at least partially closed by an underlying portion of the base, wherein a first set of the cells is located in at least a heel region, each of the cells of the first set being oriented with its major axis pointing forward and laterally, and a second set of the cells is located in at least a portion of a forefoot region, each of the cells of the second set being oriented with its major axis pointing forward and medially, wherein the plurality of cells corresponds to the plurality of cavities. a base having a peripheral edge, the peripheral edge having a footwear sole shape; and a frame disposed at a top side of the base and comprising a network of interconnected walls defining a plurality of cells, each of at least a portion of the cells having a bottom at least partially closed by an underlying portion of the base, wherein a first set of the cells is located in at least a heel region, each of the cells of the first set being oriented with its major axis pointing forward and laterally, and a second set of the cells is located in at least a portion of a forefoot region, each of the cells of the second set being oriented with its major axis pointing forward and medially, wherein the plurality of cells corresponds to the plurality of cavities.