frequency that isn't covered by the cancellation. Listening or watching something I don't really notice it, but if I want to just have the cancelling on for some quiet time I might as well be using a listening device.

AirPods with cancellation are more comfortable, but less effective and run out of battery in about 4 hours. My over ear Bose will only lose about 10% charge in the same time as the AirPods running out. On long international flights the over ear start to make my ears sore.