All masks are made with two layers of quilting cotton, adjustable metal nose wire, and extra soft elastic ear loops.
Washing
Fabric is always prewashed and dried, so shrinkage will not be an issue.
I still recommend hand washing masks in cold to lukewarm water with laundry detergent, and then hanging to dry. This will help keep up the integrity of the fabric, and it will result in less bending of the nose wire.
Laundry detergent is a surfactant and will break up the lipid membrane* of SARS CoV-2, thus killing it. (A lipid membrane is similar to a cell wall)