The mask is made of two layers. The outer layer is highly durable, high definition polyester fabric & inner layer is comfortable soft cotton fabric. This does not cause any skin irritation while using. The mask comes with two filters. The filter (SITRA certified: PFE 98.96%, BFE 99.35%) is inserted between the inner & outer layers of the face mask. Also please note that there are two filters for each mask. One inside the mask and one additional per mask One filter can be used for approx. 15 days if used for 8 – 10 hours.