Which organic material is noted for not being heat moldable?

Cork is recognized for its unique properties, which include being a natural, lightweight, and resilient material. Unlike other materials often used in footwear and orthotic applications, cork does not become heat moldable; this means it cannot be shaped or altered effectively using heat. Instead, cork provides consistent cushioning and support in its natural form, making it an excellent choice for insoles and footbeds as it retains its structure without the need for heat manipulation.

Leather, rubber, and plastic materials can be subjected to heat and molded to fit the wearer's foot or specific orthotic needs, which makes them versatile in creating custom footwear solutions. The ability to mold allows these materials to provide a better fit and increased comfort, particularly for therapeutic shoes tailored to individual requirements. In contrast, cork’s inherent properties maintain its form without the need for heat, emphasizing its role as a reliable and supportive material in therapeutic shoe fitting.