 An eco-friendly sustainable thermal insulator has been developed using jute felts, which have a self-sustained semi-rigid structure and can be placed on various surface profiles due to their balanced flexural rigidity and fibre surface properties. The study found that the felt with an aerial density of 500gM2 had the best specific thermal insulation performance, reaching up to 341 m2k kW in four layers. Jute felts were also found to be cost-effective compared to synthetics and facilitate remarkable savings in floor space. The ease of tailor-ability of jute felt was also studied, with the study finding that it has inherent multiple lumens within fibre structure, partial anisotropy of polymer chains, and innumerable tiny gas pockets within the felt structure as major reasons for its high thermal insulation. This article was authored by Karthik K. Samanta, Izhar Mustafa, Sayyandik Debnauf, and others. We are article.tv, links in the description below.