SBS copolymers made by styrene and butadiene linked homopolymer blocks belong to the class of thermoplastic elastomers (TPE) whose elastic behaviour – the properties to change and recover the shape when a force is first applied and then removed – and thermoplastic behaviour – the property to become soften, viscous and free-flowing like a liquid when heated and return solid when cooled at room temperature – are joined together in the same material.