Although it isn’t in the tech specs, the heel Zoom is firmer than the regular KD7. Nike did a similar change with the Lebron X and Elite and they firmed these up about the same amount if not more. I do like this improvement a lot because it helps improves response time and stabilize the heel area from dreaded rollovers. These passed my heel test thanks to the increased Psi. Forefoot Zoom feels exactly the same as the regular KD7.