A thermoplastic material and more particularly a substrate coated or impregnated with a thermoplastic composition. The material (1) comprises a fibre-containing substrate having two surface layers (2A, 2B) and an intermediate spacing layer (3) with fibre strands (4) connected between the surface layers; wherein the substrate is impregnated with a thermoplastic composition. The material is suitable for producing for example orthopaedic devices. Also a method for preparing such devices and devices produced with the method.