Designed for comfort, efficiency and style with an integrated filter socket, you get the most out of each use. - The adjustable straps secure your mask in place and ensure long-wear comfort. - Integrated metal nose clip nose for a better adjustment and to avoid fog on glasses. - 2 layers of 100% natural hypoallergenic cotton designed to enhance the breathability which allows easy long-wear for all Small & Large Size It is softer on the skin, and safe for children. Tested and certified by: Intertek. - The medium size comes as a 3 Layers. Each style was individually designed by a local Montreal artist. Our masks include: S & L Sizes: 1 x filter PM2.5 made of 5 additional protective layers for a total of 2 + 5 layers. Medium Size: 2 x filter PM2.5 for Medium size - for a total of 3 + 5 Layers. - Filters are reusable for up to 40 Hours while wearing your mask. *Model is wearing size Medium