SBS based on unsaturated block copolymers consisting of the ridgid phase of polystyrene and the soft phase of diene. The presence of hard, polystyrene domains in the elastomers matrix provides physical crosslinking products with SBS. This allows to replace ths classic vulcanized rubber in many applications, using simple processing methody such as : injection moulding or extrusion. This materials have very good flexibility, are very easy in procesisng and coloration. The unfilled character of soft phase makes, that SBS have limited resistance to:weathering, ozone and UV. Application: for footwear, technical products such as gaskets, handles, mats and toys, decorative items, etc.