The dual-density PWRRUN cushioning is likely intended to provide a comfortable and supportive ride for runners. The more adaptive upper may help the shoe fit better and provide more support where it’s needed most. Overall, if you’re a runner looking for a shoe with good support and cushioning, the Omni 21 might be worth considering. However, it’s always a good idea to try on a shoe and test it out before making a purchase to make sure it feels comfortable and supportive for your specific needs.