The present invention relates to a Reinforced Form Stable Phase Change Material (RFSPCM) and product thereof. Reinforcement with chemically treated fibers, of polymer in Phase Change Material (PCM) matrix gives a uniform blend of a stable form. This Reinforced Form Stable Phase Change Material (RFSPCM) according to present invention is nontoxic in nature, flexible, has high latent heat and high tensile or tearing strength both above and below the melting point of Phase Change Material (PCM). Further, the composition is so stable that it can easily be heated and cooled without leaking out its Phase Change Material (PCM). The present invention provides a simple Phase Change Material (PCM) product for user for providing stored heat that has improved safety and handling ability.