A flexible cellular foam (1, 112, 114, 116, 122, 124) or composition (300a, 300b, 300c) contains a flexible foam structure that comprises a plurality of highly thermally conductive solids including nanomaterials (10, 42). The thermally conductive solids may be carbon nanomaterials (10, 42) or other metallic or non-metallic solids. The carbon nanomaterials (10, 42) may include, but are not necessarily limited to, carbon nanotubes and graphite nanoplatelets. The highly thermally conductive solids may include but are not limited to micro- sized solids that may include graphite flakes, for example. When mixed within flexible foam, the presence of nanomaterials may impart greater support factor, greater thermal conductivity, and/or a combination of these improvements. The flexible foam (1, 112, 114, 116, 122, 124) composition may be polyurethane foam, latex foam, polyether polyurethane foam, viscoelastic foam, high resilient foam, polyester polyurethane foam, foamed polyethylene, foamed polypropylene, expanded polystyrene, foamed silicone, melamine foam, among others.
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