Reusable breathable mask constructed from USA-made silver non-woven fabric. Silver is known for antimicrobial properties. Lycra binding. Zigzag stitching. Cord lock toggle for easy adjustment. Small batch production! Washable. While it was created out of demand for the Covid-19 crisis, it's a keeper for any future cold/flu season. Also functions well for warming air taken into your lungs during cold-weather exercise.