I’d like to know that as well. The AirPods 3 were NOT comfortable at all which is why I returned them and went back to the AirPods 2. These new AirPods 4 are being marketed by Apple as the most comfortable AirPods which I definitely find appealing.
“AirPods 4 are the best headphones Apple has ever created with an open-ear design, setting an entirely new benchmark for fit and comfort. The new design is built with an unparalleled data set that uses advanced modeling tools, like 3D photogrammetry and laser topography, to precisely map and analyze thousands of ear shapes and over 50 million individual data points in total. This process helped refine the design to deliver the most comfortable AirPods ever with one shape that naturally fits even more users around the world.”