3M's masks were conceived as bra cups

Two Historic Brassiere-to-Face-Mask Innovations

3M N95 MASK CUP STYLE 3M8210N 20/BX

8833 FFP3 valved cup-shaped disposable respirator mask - 116400 - 3M

3M Doubled Production of N95 Face Masks to Fight Coronavirus - Bloomberg

Woman Invents Bra That “Doubles” as Two Emergency Facemasks

Are 3M N95 masks effective? - Quora

Emergency Bra' doubles as safe-breathing mask – Boston Herald

Sara Little Turnbull, The Designer Whose Bra Cup Design Inspired N95 Mask, Her Ultimate Ambition

BRA MASK (how to)

The N95 mask: The untold origin story

My 3M N95 Respirator Use and Care Information, Worker Health and Safety

From Bra Cups to PPE: The N95 Story