Made from Japanese Cotton. Elastic color may vary. Machine wash cold, tumble dry low. Elastic is purposefully left long in order to fit the most head sizes. If you apply a small flat knot at each end, it will size the mask down without affecting comfort. Mask is double layered and has a third open layer to accommodate a filter such us a PM2.5 (find them on Amazon) or cut up coffee filters, vacuum bags or tea towels.