AirWave P2 Particulate Respirator, Size Medium/Large (10 per box)Exclusive easy breathing wave design Unique waves double the filter surface area of our comparable respirator Dura Mesh shell provides bi directional protection from dirt on the outside and moisture on the inside Less resistance, better breathability* FlexFit design expands and contracts as you move and speak, for optimal comfort Ideal where unvalved respirators are preferred Less cost than valved respirators Longer wear means less cost Softspun