It is a special polymer thermoplastic compound consisting of polyvinyl chloride (PVC) and chemicals melt blended by extrusion and injected. Even if the PRPro blend is employed to produce attractively priced boots, it provides a good resistance to acids, manure, fertilisers and sprays as well as a good elasticity and mechanical resistance. All components are in accordance with Directive 91/338/EEC regarding the prohibition of using harmful substances such as Nickel, Lead and Cadmium.