Fig 1.
Pictures of the tested fit hacks applied to KN95 and surgical masks on two mannequin heads for display.
The male mannequin head is the size of an average male, while the female represents the size of a small female head or young teen head.
Fig 2.
Fit hacks applied to KN95 masks.
Gray portions of the bars indicate the performance without the application of a fit hack. Green portions of the bars indicate the amount of improvement. The red portion of the bar indicates the amount of decrease in performance.
Fig 3.
Fit hacks applied to surgical masks.
Gray portions of the bars indicate the performance without the application of a fit hack. Green portions of the bars indicate improvement gained with the application of a fit hack. The red portion of the bar indicates a decrease in performance from applying the fit hack.
Fig 4.
A single fit hack applied five times to one individual demonstrates how reliable the application of a hack is at improving fit factor.
Fig 5.
Many fit hacks were unable to fix fit issues around the nose bridge.
This impacted wearers with more prominent noses and provided an example of one facial feature critical to the efficacy of fit hacks.