For me as a glasses wearer, the shielding is good and at least on a par with in-ears.

I also wear glasses myself and wear these headphones when mowing with the lawn tractor and when I'm travelling home in rush hour traffic on the train and streaming videos.
In both situations, it shields very well. ANC works perfectly and is at least as quiet, if not better, than my Sony in-ears. The padding is very comfortable and soft, so that it also adapts very well to the temples of my glasses.

Hi,

The WH-1000XM4 headphones combine elegance and comfort. The ultra-soft, pressure-relieving ear pads made of urethane
urethane foam distribute pressure evenly and improve support and fit. And because they are so light, you hardly feel that you are wearing headphones.
You can find more information on our support page.

Sony Europe