RAKZA X is the first rubber with NSS (New Surface System), Yasaka's new production process to improve the grip of the rubber surface. NSS gives a stronger "touch" when hitting the ball, and the control in both attack and blocking is improved. 
In RAKZA X Soft the same surface rubber is working together with a relatively soft sponge, Feel Sponge, with good catapult effect. The combination of the elastic sponge and high grip top sheet increase the the feeling and improves the control of your game.