Genuine question (and I’m not being nasty - just curious) why does being double jabbed have any relevance to wearing a mask?
Double jabbed people present a much lower risk to others, both in terms of likelihood of becoming infected (though lower prevention with delta for both AZ and Pfizer than for original or alpha) and in terms of likelihood of onwards transmission.
I think the CDC advice is that vaccinated people don’t need face coverings.
That said, delta is a fucker, cases are rising exponentially and despite having been double jabbed two months ago, I’ll keep wearing one in crowded places.