Irbis II combines the unchanged top-sheet of Irbis with a in 2016 newly developed medium-hard sponge. This sponge offers extreme speed and in combination with the fast Irbis top-sheet the whole rubber has more then enough speed for a very aggressive style of playing. Fast and flat topspins, powerful shots, but also if necessary undercut balls and short blocks - everything is possible with Irbis II. Also Irbis II is not "factory-tuned" but instead the very strong built-in speed-gluing effect is permanently integrated into the rubber.
Drawback: Irbis II is heavier then Irbis.
Hint: The sponge of Irbis II is the same as the one used for Marder IV.
Please choose yourself: If your goal is ultimate spin combined with high speed, Marder IV will be your choice due to its more tacky top-sheet. If you are focused on the highest possible speed and fear Marder IV still might be to slow, but also want to have good spin and control,Irbis II will be your rubber.