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ADVERTISEMENT Are two cloth masks better than one for preventing spread of COVID-19? Four layers is a challenge, though, in terms of design, particularly for the home or artisanal sewer, and few commercial masks have four layers. 4 min read Double masking has emerged as a crowd-sourced method for adding extra layers to our masks, using the masks that we have a response to concerns about the overall direction of the pandemic and the transmissibility of new COVID-19 variants. When our group recommended cloth masks as a worthwhile additional effort to reduce transmission of COVID-19, some of the masks that we had identified in the literature were three- and four-layer masks: in an experimental setting, they were very effective at blocking particles exhaled by the wearer. ....
Disclosure statement Catherine Clase is a member of the Cloth Mask Knowledge Exchange, a research and knowledge translation group which includes industry stakeholders. Industry stakeholders contribute to the Cloth Mask Knowledge Exchange by contributing to grant funding, and through in-kind contributions of time and expertise. Industry stakeholders make masks and distribute polypropylene and other fabrics. They may potentially benefit from this article. Catherine has received consultation, advisory board membership or research funding from the Ontario Ministry of Health, Sanofi, Pfizer, Leo Pharma, Astellas, Janssen, Amgen, Boehringer-Ingelheim and Baxter. In 2018 she co-chaired a KDIGO potassium controversies conference sponsored at arm s length by Fresenius Medical Care, AstraZenec, Vifor Fresenius Medical Care, relypsa, Bayer HealthCare and Boehringer Ingelheim. ....