ANTI-MICROBIAL: Each Mask is treated with an Anti-Microbial treatment to inhibit the growth of microorganisms on the mask. This extensive treatment also acts to prevent the build-up of odour in the mask during long periods of use. FILTERS THE AIR YOU BREATH IN: The dual layer construction minimises particles entering while allowing the user to breathe freely. ULTIMATE COMFORT: The inner fabric of the Mask is comprised of a soft touch cotton-rich fabric. The Fabric coupled with the ergonomic stretch earloops creates an extremely comfortable wearing experience. WASHABLE. REUASBLE: Each Mask is washable, this increases the lifespan of the mask, removing the environmental impact of traditional disposable masks. The mask can be washed 20 times. ISO certified. Small: 15x12.5x7.5cm. Loop relaxed: 12cm, Loop scretched: 16cm. Medium: 15x12.5x7.5cm. Loop relaxed: 14cm, Loop scretched: 20cm. Large: 15x12.5x7.5cm. Loop relaxed: 16cm, Loop scretched: 24cm.