This 100% certified Organic Cotton Mask is made with three layers of soft, natural colour cotton. The mask is very effective at reducing exposure to dust, pollen, mould, dander and lint. It filters 83% of particles down to one micron. No dyes or bleach have been used on the organic cotton. Adjustable non-organic, natural cotton twill ear loops hold the mask in place effectively sealing the area from pollutants. It is naturally latex-free.