a balloon catheter having a multilayer catheter shaft is formed to have an inner layer and an outer layer , where the inner layer and outer layer are selected from materials that enhance the pushability of the catheter while preserving the flexibility . using a combination of a high shore d duromater value material and a lower shore d duromater value material , various combinations of multilayer catheter shafts are disclosed utilizing different glass transition temperatures and block copolyamides to obtain the desired characteristics .