The Vice President-elect has worn the Classic Care Face Mask ($35) by Wolford. It is a double-layered mask with adjustable nose wires and a water-repellant finish.
The mask is also available at Amazon ($36.90) Many thanks to Eva Thomas at InStyle for the heads-up on this item! The VPE wears many black masks; occasions when I am sure she wore this Wolford style include a September 17, 2020 campaign visit to Philadelphia (below) and a visit to Detroit September 22, 2020.