Urethane Casting Urethanes have many of the advantages of plastics combined with the flexibility and resilience of rubber. This makes them ideal materials for the cushioning requirements of insoles and foot care products. Being liquid systems, urethanes are poured or cast into moulds. Because of their superior properties urethanes are more cost effective and functional than other materials and are ideal when you need parts that have properties similar to production parts. Bestol employs a wide range of casting technologies to meet the most complex insole and foot bed design requirements.