With growing concerns over more-contagious coronavirus variants, more people are double masking-that is, wearing a surgical-style mask underneath a cloth face mask. A surgical-style mask offers great filtration, while a good cloth facemask can be adjusted to secure a good fit. The two masks work in tandem to maximize both fit and filtration overall. In fact, a CDC study on two dummy heads concluded that when both dummies were double masked with a surgical-style mask and a well-fitting cloth face mask over it, the transmission of potentially infectious aerosols was reduced by around 95%. (The study also found that people can achieve similar effects by wearing just a legitimate surgical mask but knotting its ear loops and tucking in its sides as shown in this video.)