In one embodiment, the invention is a nonflowable gel composition including a vegetable oil and a thermoplastic elastomer. The nonflowable gel composition is characterized by its inability to flow when subjected to pressure. In another embodiment, the invention is a resilient gel composition including a vegetable oil and a thermoplastic elastomer. The resilient gel composition is characterized by its ability to recover its size and form following deformation. In another embodiment, the invention is a support surface for supporting the human body, including the composition and a holding structure for holding the composition.