This table lists the investigated face masks, mask alternatives, and mask material (masks are depicted in Fig. 2). Masks marked with an asterisk (*) were tested by four speakers; all others were tested by one speaker.
| Mask, name | Description |
| 1, “Surgical”* | Surgical mask, three layers |
| 2, “Valved N95” | N95 mask with exhalation valve |
| 3, “Knitted” | Knitted mask |
| 4, “PolyProp” | Two-layer polypropylene apron mask |
| 5, “Poly/cotton” | Cotton-polypropylene-cotton mask |
| 6, “MaxAT” | One-layer Maxima AT mask |
| 7, “Cotton2” | Two-layer cotton, pleated style mask |
| 8, “Cotton4” | Two-layer cotton, Olson style mask |
| 9, “Cotton3” | Two-layer cotton, pleated style mask |
| 10, “Cotton1” | One-layer cotton, pleated style mask |
| 11, “Neck Gaiter” | One-layer polyester/spandex, 0.022 g/cm2 |
| 12, “Bandana”* | Double-layer bandana, 0.014 g/cm2 |
| 13, “Cotton5”* | Two-layer cotton, pleated style mask |
| 14, “Fitted N95” | N95 mask, no exhalation valve, fitted |
| “Swath” | Swath of mask material, polypropylene |
| “None”* | Control experiment, no mask |